Charge Galaxy S7 battery

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• I was trying to find out how to charge ot in a car, since going on road trip, but no details. Thank you.

  • You just need a car charger if your car doesn't have any USB ports.

• Thanks so much for your quick and detailed response (sorry mine is so slow). Yes, there is a lot of contradictory info out there. In addition, strategies appear to be different for laptops than for phones. Your suggestions make sense, Thank you again.

  • Enjoy the phone.

• Maybe I'm reading this wrong, but it seems like there's a contradiction in the article. You say, "It is not necessary to top up Galaxy S7 battery," and below that you say "Don’t disconnect Galaxy S7 from the charger before it is fully charged." What do you mean by top up? I assumed "top up" means "fill",like when you top up your gas tank (which means overfill). Do you just "add a little more"?

  The AccuBattery app is designed to warn you before your battery is fully charged, say, to 80%. Their reasoning is that fully charging it creates a chemical reaction at the electrode end that can damage the battery. You seem to disagree. What's the science behind your view?

  • For a smartphone battery, the number of charging cycles (start charging, charging, stop charging) affect the battery life a lot. And the first step (start charging), although very short, or almost instantly, may have a similar impact as charging one or two hours. The analogy one engineer explained to me is cold starting your car engine. So, the bottom line is to reduce the number of charging (of course without affecting your usage).

    “Top up” does the opposite. Some owners tend to connect the phone to the charger when there is a charger without calculating whether he can charge the battery later. This increases the number of charges and therefore may hurt the battery life.

    When you charge the battery, you should charge it to full if possible. I do not agree with that you should avoid charging the battery to full. As mentioned, the bottom line is to reduce the number of charges (without affecting usage). In one charging cycle (start, charging, stop), the process is controlled and regulated by the software. There are no additional chemical reactions, as I know, when it is fully charged. When it is fully charged, the charging will stop automatically, the battery is not in charging state. The charging port will draw lower current. For Li-ion batteries on smartphones, the battery management system (circuits) will adjust the electric condition to accommodate the trickle current if the phone is off (battery management system will not be off unless the battery is fully discharged). If the phone is on, the trickle current is not an issue because the phone requires a higher current.

    Anyway, there are many different views on this. Some are outdated. Some are not for smartphones. Some are ridiculous. It is up to you to choose which one is sensible. Unfortunately, I do not find any credible scientific research reports on this (many old reports are not relevant).

• I'm still on the s7 edge???? anyway I have been reading multiple posts about how it's not safe to charge any phone till 100% fully charged...I want to ask how true this is cause idk I get scared everytime i charge overnight and it reaches 100% fully charged so is it safe to charge till 100% fully charged or not?

  • What are the safety concerns? As long as you use the branded charger, you should not worry about fire.

    If you concerns about battery lifespan, you should charge it to full if you charge the battery. Lithium battery has a shelf lifespan of a few years only.

• This article was very enlightening for me. Thank you.

  One area that caught my notice especially was about the risk of damage to either the adaptive charger or the S7 Edge itself from a power surge when the charge connection is left overnight. Can someone please tell me if the charge level is regulated by the wall charger or the phone? I was hoping to get an idea of which of the two is more prone to damage from a mild to moderate (excluding direct lightning strikes) surge when the phone is left plugged in after it is fully charged.

  Is it recommended to charge these phones through a surge protector for maximum protection against surge damage?

  Thank you.

  • Both the phone and the battery call regulate the current. But almost all consumer chargers cannot turn themselves off automatically. A trickling current will then be maintained if the phone is connected. This should not damage the battery. But it's not good for battery in long term. And most people change battery every 1-3 years, there impact is very marginal.

    Surge protector can protect the wall charger if power supply in your region is not stable. Any good wall charger should have no issues with input voltage fluctuations. The output is well regulated.

• I fell asleep while phone was charging, I woke up three hours later. Did I damage the phone or battery by over charging? I have the S7. I'm worried I have caused major damage.

  • No, the battery itself can prevent overcharging. It's ok to leave the phone on the charger overnight if you need to charge the battery. It doesn't make sense to get up and unplug the charger.

    Enjoy the phone and don't be the slave of your phone.

• I'm in the Army, and the vehicle I operate does not have the normal outlets inside. The outlets are labeled as "24VDC", and have slightly wider prong openings. Is it safe to find an adapter to use inside the vehicle to charge my S7 Edge with? If so, could you point me in the right direction?

  • A lot of car chargers work for both 12v and 24v. You can find many in Amazon. But you need to find a suitable adapter if the port is not standard. Also some army vehicles use non-standard ports in purpose. Anyway, you can ask the technician who maintains the car.

• Can i charge a new s7 with a fast wireless charger for the first charge?

  • Yes, you can. Quality of the charger is more important.

    • Don"t ever use fast charger, will destroy your battery in less then 2 years !

• Is it okay for you to leave your samsung s7edge charging overnight in a fast wireless charger or usb port?

  • It’s ok. It doesn’t make sense to get up at 3am in the morning to unplug the phone.

    For wireless charging, the charging pad will cut off power supply to the phone automatically when battery is fully charged.

    For charging through USB port, The minimum trickling current need to be maintained aftet the phone is fully charged because the phone cannot turn off the power supply from the adapter.

    Anyway, enjoy the phone. You get the best ROI if the phone can make you happier and/or more productive. Battery will die anyway in a few years, but very likely after you change your phone.

• Hi
  I wanted to know about best way to charge my S7 edge to have a good battery life , as I use my phone so much every day and read an article about tips to have the best charging way they said that never fully charge every day (maybe once a month is fine 0-100%) is it right ? I plug my phone in when its around 20% to around 80% then plug it off . can you help me on this ?
  thanks...

  • There are so many contradicting claims on how to charge smartphone battery. But there are very few scientific studies on this. most of the researches are not relevant, or based on different batteries (manufacturing process evolves very fast).

    You have to make your own judgement.

    To my knowledge, the tips you mentioned are probably not true. Here are the basic principles (as mentioned in the page):
    1). the phone should work for you. Don't be a slave of your phone no matter how expensive it is. Enjoy your phone or improve your productivity. You get back the value only when you use the phone.
    2). plan the charging. You need to change the battery only if you need to do it. You should know when you can plug the phone again and whether the battery is enough.
    3). charge to full. Once you decide to charge the phone, it is better to charge it fully. This is more or less like exercise.
    4). Do not use the phone heavily when charging. Otherwise, you created unnecessary strain on the battery.
    5). Your battery have a lifespan (shelf life), even you do not use it.

    Anyway, enjoy the phone.

• I have a remax vanguard 10000mha(first charging 2.1a) power bank.when i connect the phone to power banks 2.1a port it doesn't.first charge my s7 edge. I am really confused cause the power bank says it is first charging capable. Need help

  • 2.1A port means the output is 2.1A. It is faster than standard USB 0.5A.

    But this is NOT fast charging. Are you sure it is marked as "Quick Charge 2.0"?

• The guy at the store at which i bought my phone said that if i use the fast charger wall block then i shouldn't use any other or it will break the battery. Is this true?

  • No, you can use any USB chargers. Samsung never asks you to use only one type of charger.

• Hi.

  I was wondering if I can use my ZenPower powerbank for my S7 Edge? The powerbank is 10050 mAh, Input/DC 5V/ 2A and Output/DC 5/1V/ 2.4A.

  Thank you.

  • Of course, you can. Galaxy S7 and S7 edge don't need special powerbank. If it works for Asus phones, it should also work for S7 and S7 edge.

    Only fast charging requires special devices.

    • Thank you for your response. :)

      I also wonder: Will the fast-charging feature work for my S7 Edge if I use the ZenPower powerbank or not? Can I use the Samsung cable that came with the S7 Edge in case I charge the phone through the ZenPower powerbank?
      Thank you! :)

      • You can find all information on a USB charger ( if provided ), 9volt = FAST charging, 5volt = REGULAR charging. Don't ever use fast charger, will destroy your battery (non removable) in less than 2 years !

      • Fast charging only works with adaptive charger. Most powerbanks don't support it.

        Any quality USB cable should work.

• Wow...great questions being answered here. Very helpful. I have two questions:

  1. Is there a way to enable the "battery full" notification when the battery becomes fully charged? I thought when I first purchased the S7 it was enabled. All of a sudden, it no longer is enabled.

  2. Any particular reason a battery drains so quickly? In the last month of so, my S7 battery drains quickly in the first 50%. It used to drain very conservatively (5 % overnight). Now, I wake up and it has used 35% of the battery overnight. Wondering if I picked up a virus or something..any help would be appreciated.

  • The battery full notification is available only in some regions.

    For battery drain overnight, you can check detailed battery usage. It's easy to find out the app draining battery. You can try to reboot the phone to see whether it helps. If the battery drain is caused by ghost processes, a reboot should fix it. If it's caused by some apps, you can find it on the battery usage report.

• Hello, I have a Galaxy S7 Edge, can I use safely a charger rated at 9V 1.67 amp, instead of the original 5V 2.4 amp safely without damaging my phone. I mean I use the original at home and the other one at office. Are there any deals with this ?

  • No, for 9V charger, you should only use Samsung's adaptive charger (like the original one), which can also output 5V.

    Anyway, get a quality charger from a brand you trust. Such chargers should mark clearly on the proper usage.

• Can the galaxy s7 be charged using the usb connection in my honda crv or do I have to use an adaptor for the lighter outlet?
  We just switched from an old motorola atrix 2. Can the atrix 2 wall charger be used?

  • yes, it should be no issue. You can use any USB charger for Galaxy S7. For safety considerations, you should use branded chargers. Just do not use chargers without safety marks.

• I have a charger from my old s5, uses 5.3 volts instead of 5 volts. Will this cause ano issue with charging my S7 active?

  • It's safe to use. There should be no issues. Your Galaxy S7 active will adjust the charging speed. BTW, in fast charging mode, the charging voltage can be as high as 9V.

• When I charge my mobile and usage it with data and bluetooth it becomes so hot is it normal.

  When I use my s7 and download app from app store my signal fights to either stay as H+ or LTE I feel a hotness in phone .

  What temperature Justify what usage

  I MEAN if I usage heavy usage with LTE data Bluetooth hotspot with youtube and background fb instagram etc how hot it should justify as normal phone S7 please please help

  • I have S7edge my battery SWELLED like balloon fortunately without harming the phone just push, unlocked the back cover. There is no electronics to control the formation of gas inside the batteries.You can find all information on a USB charger ( if provided ), 9volt = FAST charging, 5volt = REGULAR charging. Don’t ever use fast charger, will destroy your battery (non removable) in less than 2 years !

  • You should not use the phone heavily when it's being charged.

    It's normal that your S7 is hot when you charge it even without using it. But you should not worry about the temperature. Your Galaxy S7 has several protection mechanisms to prevent overheating. For example, S7 can automatically show down the charging, and show down the CPU.

• Hi I want to thank you for your comments first.

  I want to confirm what Tempeature suits or normal usage wise.

  I have an app that tells me the curent S7 temperature .

  When I am charging with USB cable less than 20% and using data and bluetooth how hot it can become.

  When I download apps from App store I see few hot of my mobile.

  Sometimes my signal fights to H to H+ and to LTE so does it make phone hotter as well.

  Please reply

• I just purchased an s7. Reading your article I went into settings to check the batter settings. My phone shows a 'Fast Cable Charging feature but not a Fast Wireless Charging feature. Do some phones not have this feature?

  • It's normal. Fast wireless charging appears only after you put the phone on the fast wireless charging pad first time. In other words, it will not show up before you use fast wireless charger. This is logic because the option is for you to disable fast wireless charging. If you never use a fast wireless charger, it doesn't make sense to show the option.

    Anyway, all S7 and S7 edge support fast wireless charging.

• Hi, I have very old original samsung charger from Samsung Wave 533, probably like 5-6 years old :) I have my original S7 charger in home and this one in my workplace. Old charger specs - MODEL: ETA0U10EBE, INPUT: 100-240V, 50-60Hz 0.15A, OUTPUT: 5.0V - 0.7A. Despite of charging really slow, is there any risk that it may do some damage to my battery? I can keep it plugged all day long so i don't mind "slow charge", im more interested whether it can shorten my battery ?

  • As long as the charger works, it should not cause any damage to S7 battery. Actually, if you charge the phone overnight, it is a good habit to use a "slow" charger.

    But it is a bad habit to use the phone frequently when it is connected to the charger. It is not good for the battery. When you connect the phone to the charger, you should disconnect it only after it is fully charged. It is NOT necessary to "top up".

    • Hi, thanks a lot for the answer! :) I have one more question that is bugging me. I believe I've read that charging up to 100% battery is not necessary or even harmful if you leave it plugged for a long time because of "poking" the phone with electricity everytime battery drops to 99%.
      I can understand that using phone while it is plugged to cable is not healthy, on the other hand I don't know why you insist on charging up to 100%. Currently I don't let my battery drop under 20% and then charge to 85-95% and plug off. Is there any real benefit of charging your phone to full 100% battery?

      • For calibration. The phone percentage is estimated based on a formula including certain factors. If you the battery is not charged to full, the "full" is estimated. And all other estimation is based on this estimation. This is one of the reasons why many vendors recommend you to charge it to full (some even recommend you to charge 8 hours) before using the new phone. As I know, it's actually not necessary. But if you often charge the battery to 90% for example, it would be difficult for the phone to estimate battery level. The uncertainty or the error will usually be larger.

        Many phone owners noticed when battery reaches 100%, it is still charging a few mins until it's fully charged. Also jumping from 99% to 100% take very long time, especially for an old battery. This is partially related to calibration errors.

        Once battery is fully charged, charging will stop. It doesn't top up the battery to 100% unless you reconnect to the charger. Instead, tricking current regulated by the phone will be used from the charger. At this time, phone cannot turn off current from the charger. This tricking current will be used, instead of battery. Battery will be used only if tricking current is not sufficient (the phone can regulate this current depending on phone manufacturer and charger). Even in this case, battery will not be topped up. But you will notice battery drops from 100 shortly after the phone is disconnected from the charger.

        Disclaimer: I am not a battery expert. All battery experts will always tell you it depends.....

        Anyway, enjoy the phone and use as you like. The phone is your slave; you are not a slave of the phone.

• Great approach and explanations!
  I didn't find any question / comment on this:
  My original charger is "9V / 1,67A or 5V / 2,0A". (shopped in Brazil)
  Does the Galaxy S7 use 9V for fast charging?

  • Yes, fast charging will use 9V and up to 1.67A. The switching process from 5V to 9V and then to 5V is handled by the phone automatically. The current is also regulated automatically.

    Please note, some vendors may use 5V/3A for turbo/fast charging. These charges will not work with Samsung's fast charging.

    So, it's better to get Samsung branded fast charger (adaptive charger) if you need a spare one.

• Hi,

  I was wondering what the voltage capacity of my Galaxy S7 is? I hadn't tried opening it but now that I wanted I realized its harder than expected. My phone is from the US, but I will be traveling to Thailand. I want to make sure the Voltage is fine. Or know the range (110V - 240V) or is it just 110V and I need an adaptor?

  Thanks! :)

  • The voltage should be marked in the power adapter (charger), not on the phone. Normally, it is 110~240v and you should not worry about the adapter. But you can double check the mark on the charger.

    • When checking the voltage for international traveling always check the frequency too (should be 50 or 60 Hz, or ideally the range from 50-60 Hz). If the adapter is e.g. 50 Hz and the local grid is 60 Hz, it will damage the charger.

• When using Android Auto my S7 Edge says its charging but its actually draining very fast. 30%/hr. I found some USB 2.0 Power Enhancer Y Cable online. Would using one of these to a separate car USB charger hurt the phone? I have both 1A and 2.1A chargers available to supplement the current if that would help. My guess is that car USB port for Android Auto does not have enough current.

  • Not sure about it. But such a cable is very common for PC peripherals. Very likely it is OK for your phone. Just try to get a branded one.

    Some cars may be designed not to charge the phone when using Android Auto (in car display).

• I have the wireless charger on my desk and use it to charge my S7 Edge. Very often during the day whilst it is charging, I have to remove the phone if I am going out etc. Will removing and replacing the phone on the pad, before it is fully charged, a number of time a day, cause damage to the battery?

  • It should not cause any damage to the battery. But it's a bad habit of charging Galaxy S7 battery. It may increase the wear and tear for the battery. But there are no solid evidences for this claim. Normally, you should charge the battery only when you need to.

    Take it easy and enjoy the phone. If you are a heavy user, you need to replace the battery after 18-24 months anyway.

    • Thanks a ton for your prompt response.

• I would like to purchase a "portable charging pack" for my daughter, she has a Samsung S7 Edge. Do you recommend one with 20,000mAh? Will this be enough to fully charge her phone?

  • It would be able to charge S7 edge 3-4 times. Galaxy S7 edge battery capacity is 3600mAh. So battery pack with 5000mAh capacity is sufficient. Anyway, try to get a quality one. The capacity is not so critical as most battery packs has more than 4000mAh capacity.

• HI, i just bought a galaxy s7 and i was so busy with work that i let it drained to zero and left it like that for a day or two after i just picked it up.

  How bad did i mess up the battery? im just really concerned that i messed it up because i need a long lasting battery for my job.

  PS. im charging it right now for the first time.

  • Take it easy. Modern batteries are very endurable (except Note 7 battery).

    It should not cause any damage to the battery. Just don't let it happen often.

• Hi

  I bought s7 edge, but did not read the quick guide first, so i just used it and let the phone's battery to drain to 20% and charge it to 100%. Am i damaged the battery with this non charge first time before using and how much big is the margin between properly charged battery and mine,which is drained to 20% before first time charge ? Thanks a lot

  • It's OK. Take it easy and enjoy the phone.

• Just 4 days back I got my s7edge I charge it to 100% and use completely in one n half days .but yesterday I put it on charge with wall charger and using the original one that comes in box when I start charging it was 29% and on fast charging mode but after two and half hours it was just 68% and says that it needs 2 hours and 32 minutes to fully charge.me so worried ,is any thing wrong with bettery.more over my s7 was not heat up

  • you probably turned off the fast charging mode in the phone.

  • It is not normal if you are using the original cable as well. Probably the cable is not inserted tightly.

• I bought s7 edge couple of months ago. It takes almost 2h and 15 minutes to charge from 0 to 100% while using normal charging. But with fast charging it's about 2h.
  Is it normal?
  Thanks.

  • It's normal, although it's bit in longer side. Charging time also depends on ambient temperature, phone usage and many other factors. Overall, it should be around or less than 2 hours to charge S7 edge with the bundled charger.

    • Also the same with me. I have my S7 Edge, i charge it in normal charging mode and it says it would take 2hrs and 19 mins to get fully charged. Whilst using fast charging, it will only be 2hrs. How come fast charging doesn't have a big difference with normal charging? Does it make any sense anyway?
      Also, do you know how long my phone would last if for example its 100% and mobile data is on continuously? Thanks in advance!

      • First, the time is a very rough estimation. You should record actual charging time.

        Fast charging only works when battery level is less than about 60%. After that, normal charging takes over. Fast charging theoretically can charge Galaxy S7 battery up to 15w (9V, 1.67A), while normal charging is 10w (5V, 2A). So, theoretically, you can save up to 25 mins (assuming full charging speed) as the capacity of Galaxy S7 edge battery is 3600mAh.

        In reality, the charging time and charging speed are affected by usage, ambient temperature, battery status....

        For the screen-on time (SOT), it is typically in the range of 3-6 hours, heavily dependent on usage pattern, app types.

• Hi,

  I recently bought an S7 edge. Battery and charging time is fine. But it has been 3x already that I experience plugging it and the screen saying 6hrs+ before fully charged. When i go to settings, under the fast charging option, it says unplug/plug cable to enable fast charging. What could be the reason for this and do i need to have this checked?

  • Are you using the official charger and cable? Anyway, by default, fast charging is enabled when a fast charger is detected. Of course, you can disable it.

    The charging time is just an estimation. But 6 hours usually indicates a low power charger was being used.

• Hi
  first I would like to thank you for trying (with great success) to clarify the mystery of modern batteries.
  Second I would like to ask a question:
  Is it OK to use as a main charger the fast charger at home and a 1amp car charger in between? Meaning Is it "OK" for the battery to charge with two different currents?
  Thank you
  Zvi

  • It should be ok. Actually, even for the fast charger, once battery reaches about 90% of the capacity, the charging current is usually around 1A.

    • Thank You !

• Very hard to unplug charger from galaxy 7.

  • You should use the USB cable in your Galaxy S7 box.

• Sir, I have a Samsung S7 egde device. Can I safely charge it with Samsung 5V=2.0A charger?

  • Yes, of course it's safe. Just remember to use branded (Samsung or other) charger and cable.

    • Im sorry I just missed the point. Its actually 5.3v=2.0A output? Is it safe to charge with this instead of 5v charger?

      • If it's a Samsung charger, it's OK. But Samsung chargers usually marked as 5V 2A or 5V 2.1A. Adaptive (fast) chargers may have 9V output as well.

        Anyway, any quality wall chargers should OK. Just don't use fake or unknown brands.

        • Thanks for your assistance. BTW the phone and the charger get a little heated. Is that okay? Itps samsung original charger previously used for note 3.

        • It is ok. yes, Note 3 charger is 5.3v 2A.

          S7 should feel warm when charging. This is normal. Even you use 1A charger, you may still feel it is warm. S7 (and the battery itself) has own monitoring and protection mechanisms to regulate the current to take. When using the fast charger in the box, it should be even warmer.

          S7 and S7 edge are safe (and they have been in market for more than 6 months). There are no reported charging or battery issues. It is different from Note 7, which should be powered off and returned.

• Should I charge the S7 with a Mophie Battery Pack together or separately? Thank you

  • Juice pack? It's not necessary. You are not supposed to remove it everyday.

• Hey, if I charge my phone everyday when it gets to about 50% to 100% is that bad for the phone?

  • You should charge Galaxy S7 battery only when you need to do so. If you know the battery is sufficient before you can charge it, then it is not necessary to top up it.

    Charging battery may cause wear and tear. But it should not be so significant. Smartphone battery can charge about a few thousands times. The shelf life span of the battery is about 2-5 years only.

• Hello. Is it bad to charge to 100% everyday? How much will it affect battery life? Thanks

  • Actually you should try to charge the battery to 100% when you charge it.

    It's bad if you try to top it. You should charge it only when you need to charge it.

    Anyway, enjoy the phone.

• I bought a new s7 edge this week. After battery ran flat on the new phone at 0% battery, I left the phone on wall charger overnight with power off. It reached 28% in the morning after 8 hours sleep.
  Same thing happened the next evening.. although the phone said it takes 2 hours+ to charge when plugged into the wall charger, it reached 33% the following morning with power off. I used my old s4 charger and cable. Fast charging is enabled on s7 edge. Should I return the phone? Thank you.

  • Why don't you use the original charger and cable in your Galaxy S7 edge box?

    The Galaxy S4 charger is not a fast charger. Probably the cable is not good as well.

• My S7 batterky is rated 3Ah . My old S5 was rated 10 Ah. The charger that came with my old S5 was rated 2 amp which is very low which takes aout 2.5 hrs to charge from 50% up.

  Battery engineers recommend charging lithium batteries at one half the capacity or 1/2 C
  the recommended charging amp rate for my S7 3 Ah battery would then be 1.5 amp. You know that the lithium battery will get hot but not high enough for its set treshold or it will shut off the charger if it does
  that is probably why you folks say not to worry. You can actually charge lithium batteries at 1C . In this case the 3ah S7 battery can handel 3 amp. Would you say its safe to charge at 3 amp? Why do you call it fast charging at 2 amp while my old S5 charger was 2 amp but never called fast charge?

  • First, Galaxy S5 battery capacity is 2800mAh (2.8Ah), not 10Ah. Very likely, your Galaxy S5 battery is too old and therefore it requires longer charging time. No smartphones have such a high capacity battery yet.

    Second, battery capacity rating and charging rate (C-rate) are independent. It all depends on battery manufacturers.

    Third, for smartphone batteries, the charging current is normally less than 2A. This equals to 10W (5v*2A). If you need even higher charging rate, some modifications in the chipset and firmware are needed to handle it. This is what called fast charging. For Galaxy S7 and S7 edge, the maximum charging rate is 15W (9V*1.67A). Fast charging only applies when battery level is less than 50~60%. After that, it will switch automatically switch back to normal charging.

    Also,10W or 15W is the maximum possible charging current. Charging is always slower when the capacity passes 80~90%. The firmware and chipset in the battery will control/regulate the actual intake current.

    Anyway, fast charging is termed in the smartphone industry as charging power larger than 10W.

    Also do not confused it with fast wireless charging, which is usually less than 7.5W. It is more or less a commercial term.

• I own a S7 edge and was wondering how is my phone protected from overcharging when left on a fast charger overnight?

  • If you are using a quality charger, it is not necessary to worry bout overcharging.

    Once battery is fully charged, the phone is smart enough not to take currents. But as the charger cannot be turned off by the phone, the phone will take trickling current from the charger. Technically, this trickling current will balance the self-discharge. So, the battery will not be overcharged.

    Anyway, it is not necessary to worry about overcharging if you are using the original or other quality chargers. But to protect environment, and to reduce the strain on the battery, it is recommended to disconnect (if it is convenient to do so) the charger once the battery is fully charged.

• I would like to ask, is it safe to charge the Galaxy S7 Edge overnight?
  because I mostly charge my phone while sleeping
  and even the light of LED turn green for quite long of hours, then I just switch off the electrical button.
  is it real it would cause exploit or burn?
  it makes me scare to buy Samsung phone.
  Please reply me thorough email as well.

  • It's ok. It doesn't make sense to get up at 2am to disconnect the charger. Enjoy the phone.

    Using quality chargers and cables is the most important in battery safety.

    The problematic battery was only reported on Galaxy Note 7. And Samsung is recalling all Galaxy Note 7 to replace all sold Note 7 devices.

• Hello. I just got a Note 7 and I am using my Note 5 fast wireless charger pad, which is working fine for the Note 7. My question is, does it damage the battery to take the phone on and off the wireless charger repeatedly? For example, I have the phone next to me at work sitting on the charger and I get a text message. I take it off so it stops charging, answer the text, and put it right back on. A few minutes later I get another text and repeat. Is it damaging to pull it off and put it on the pad so much?
  Thanks.

  • It's a really a bad habit to "top up" frequently. It adds strains to the battery. But it's hard to say it will cause any significant damages to your Note 7 battery.

    My recommendation is to charge only when you need. You can simply power off the charger when you know battery is sufficient before you can charge it again.

• Simon and who ever gave tech advise I Thank you so very very much! It's a real nice thing to do out of your busy day and the things you need to do is be selfless in coming to so many people's aid.
  Thank you, be well & take good care of yourself, sooo many people need you ?

  • Thank you for the encouragement. Enjoy your phone.

• I recently bought a samsung s7 edge, Exynos 3 days ago. Im worried since my battery only lasts half a day. Well, wifi is always on. I was on the internet or using the wi-fi for only 6 hours. And when i fully charged it, the estimated hour on power saving mode is 25 hours. Is this normal for a new phone?

  • What's the screen-on time? You should check detailed battery usage in settings - battery. If you need help to read the output, you may take a screenshot and share it in our Facebook page.

• Hi
  I seem to have trouble charging my S7 on a usb cable in my car, is it the different cable that is the problem or the 5volt charger ?

  • You can use normal USB cable to charge Galaxy S7. Also, normal car charger (5v output) should work with Galaxy S7.

    You may check the cable, or try other one.

• Sir, i would like to ask... should i always "ON" the fast cable charging? i used the wall charger.(came from s7 edge)

  and should i worry about my phone battery? if i go charge the phone when it still at 30% more than..

  • It's up to you. But fast charging should not affect your battery noticeably.

• i bought S7 dual sim and i cannot find the option fast wireless charging in the battery option ? why is that so ? can anyone help.

  • The option will show after you use a fast wireless charger took charge S7 at least once.

• I need some real help. While plugged into a wall outlet does the charger light/indicator go off when the battery is 100%. For the first week the battery charging light (The lightning bolt indicator on the top right hand corner of the screen) would stay on while the charger is plugged in even when the phone showed it was 100%. Now this week it doesn't. I need to find out what is the norm. This is my first Samsung Galaxy phone and I am freaking out about this.

  • If the phone is connected to the charger, the led color should be red when s7 is being charged, green when it's fully charged.

    100% doesn't mean fully charged. You can check charging status in lock screen (charging or charged), besides the LED color.

    • I noticed the same thing with my S7. When I first bought it, the light would glow red when it was charging and then change to green with it was full. It no longer does that for some reason. But I don't worry about it, the phone works fine anyway.

      • Does the LED light up when charging?

• I just purchased a new Galaxy S7 and put it on the wall charger over night for its initial charge. After 10 hours, it's only at 82%. Can anyone explain why that would be the case and/or what I should do to get it to 100%?

  • It should not take so long. Are you using the original charger and cable? Make sure both ends of the USB cable are inserted tightly.

    • I am expeeiencing the same thing... Also can you use a case with your wireless charger?

      • Metal case will surely affect wireless charging. Most cases should only affect the charging speed. Even the thicknest OtterBox case doesn't stop charging. But it's noticeably slower than normal thin cases.

• I charged my S7 for 6 hours the first time instead of 8... is it alright or should I connected an other 2 hours??

  • As I know, it is not necessary. Once the battery is fully charged, it is ready for use.

• How long should it take to fully charge the phone from 0-100% using Samsung Fast Charging Wireless stand? Mine seems to take around three hours.

  • For S7 edge, it is probably normal. It normally takes around 2.5-3 hours for fast wireless charger. For normal wireless charger, it will take about 3.5-4 hours.

    For S7, it should take less than 2.5 hours with fast wireless charger.

    Please note, you need use the fast (adaptive) charger for the fast wireless or wireless charger.

    • samsung claimed 80 min for 0to100% on fast charger.
      I admit that as I have the same experience BUT only with in the box Charger and Cable.

      I tried other chargers and changed the cable (even with my other samsung product cables). All of them took longer to charge my S7 flat.

      I also suspect cable change in some countries or distributors. My note8 (n5100) cable is not as good as my sister's note 8 cable. The only difference is the seller(distributer). mine seems to change some accessories like cable or charger.

• Why is my S7 buzzing which I try to charge it up? The battery goes from say 40% to zero, buzzes for quite awhile and I can't use the phone.

  • Are you using the original charger and USB cable?

• Can I use a chager of 5.3v, 2.0 on my s7? Will it cause any damage?

  • It should be OK. Brand and quality are important when buying a charger.

• I just got the S7 Edge last weekend. At work I stream music while I'm charging the phone. Whenever I'm charging the phone AND listening to music (using the Google Play app), the phone comes out of sleep mode (Always On, black screen) and the Lock screen comes on with a message at the bottom of the screen saying Charging XX% with a little animation by the home button. I wouldn't mind so much, but whenever it does this, the music gets slightly muted and then returns to regular volume once the message goes away. And it does this about every 15 - 30 seconds. It makes listening to music very annoying and frustrating. I can't find any kind of setting to turn this off. I am using an aftermarket USB charger. So far, this is only happening when I'm playing music.

  • If you turn off always-on display (AOD), does it help?

• Hi, I just got my s7 edge about a week ago. It'seems the snapdragon model. I am not seeing the full 5 hours like everyone said it had, and I am only using it at half brightness using all the battery savibg tips. I have Bluetooth and NFC off. Is this normal?

  • purely normal

    Mine does not last for 4 hours, by data and screen on. It is not the edge version.

    the battery stat declares 16 hours on fully charged battery.

  • You need check battery usage details. 3-6 hours screen time is normal.

    If the mobile signal is not good, out can consume more battery. Background activities also vary from user to user.

• I got my phone samsung s7 edge one week ago. Few first days it was fully charged in aprox 1-1.5. Yesterday it needed 3 hours and today even almost 6 hours. Could u explain me please why it is like that? Is something wrong with my phone ?

  • Are you using the same charger and cable? Make sure the cable is inserted tightly in both ends.

    With the bundled charger and cable, it should take less than 2 hours to charge the phone.

• Can we charge the battery above 20% level? Because everytime I want to charge my phone to have a full charge battery coz I will be going outdoor, I still have to use and wait until it reaches under 20% that the phone says Connect Charger...

  • Why not? Charge the battery when it's necessary.

• I have purchased a Pleson Fast wireless charger for my S7 Edge. I am using the adaptive fast charger( Along with the cable ) to power the Wireless charger from Pleson. But it takes about 4 hours for the phone to charger from 16% to 100 %. Is the range normal as the original fast adaptive charger provided by Samsung usually charges my S 7 edge in under 90 minutes. Please inform is sombody has been facing a similar problem while charging their S7 Edge with a Fast wireless charger.

  • Something is wrong. The fast wireless charger should charge S7 edge from 0 to 100% in about 2.5 hours.

    Does your S7 edge have a thick case? You can try to test the charging time by removing the case temporally.

• Hi.. I just recently got my s7 edge.. And i wonder if the samsung fast wireless charging you mention on the link is compatible with s7 edge? I saw on the amazon description link that the fast wireless charging is not compatible with the s7 edge..

  • For fast wireless charger, if it's Samsung branded, it should work with Galaxy S7 ( and S7 edge) although sometimes only Galaxy Note 5 is listed.

• Is it okey to let the galaxy S7's battery to 0% that the phone shuts down itself?

  • If you often drain the battery to such a low level that it shuts down itself, it may damage the phone. You may corrupt the internsl storage. Don't do it in purpose unless the phone is still under warranty.

• I've been using S7 Edge for a few months now and only charge the phone once per day (early in the morning). If the usage are less, the saving mode can be longer (almost 42hrs). Using the adaptive fast charger (the one in the box) usually takes less than 2 hours to fully charged (depends on the % left).

  • Hello Azra, do you know what is the temperature of your phone while charging your s7 edge? Mine is almost 40℃

    • I read it's perfectly normal and it says if it gets too uncomfortable hot temperature don't freak out the S 7 is like that

      • Galaxy S7 has its own overheating control. You should not worry about the temperature.

  • Thank you for sharing your experience.

• One more, When I lock my s7, sometimes the light of always display is high, but sometimes that light of always display is low. Any problems?

  • This is normal. The light sensor regularly check the ambient light. Anyway, Samsung doesn't allow you set brightness for the always on display.

• Hi. I have turn of fast charging and used another charger to charge my s7 but it heats the same as I use my adaptive charger from Samsung. What's the problem?

  • There are no problems. It's normal. If you really don't like the heat when chastening battery, use a charger with 500mA or 1A output.

    • Thank you. But when I use charger with 1A output (HTC charger), my s7 always turns the light on from the screen as if I click the unlock button. In fact, I dont touch anything.

      • Does this happen to this specific charger? if you press power button once, does it turn on again automatically?

        • I think it happens because of htc charger. I try another charger and it is normal. Anyway, when we use fast charging, how hot is the phone? Mine reaches nearly 40℃

        • It (battery temperature) depends on ambient temperature and phone loading when charging.

          You should not worry too much on the temperature. The phone has enough sensors to detect issues. If the temperature is really too high, galaxy s7 will stop charging automatically.

• Hi I am from Sri Lanka.I baught an original s7 edge (Exyno dual sim SM-G935FD) in 3 weeks ago. When I fully charged it says I can use only 18 hrs. That condition certified our service centre and they sait phone is ok. I am using only one sim. But I used earlier s5 long hours than s7 edge.

  I am asking you If I hard reset this phone and If I charged this phone 8 hours after reset can I keep the battery life more than earlier?

  • That's just an estimation. Don't rely on it. What's the actually screen-on time you get? You can take a screenshot and share it in our Facebook page so that others can see it.

    It's not necessary to charge 8 hours. It will not help.

    It's not necessary to do factory data reset before checking battery usage details.

• HI,

  I Purchased S7 Edge Today. i have several questions in my mind, please help me,

  1. How Long Should I charge for the first time for long lasting battery using the adaptive charger in the box.

  2. As per your above suggestions which is the best charger to use for everyday charging, is it the charger given in the box( adaptive fast charger) or should we purchase any other charger as you have mentioned as wall charger. please give me which is the wall charger which should be used for better life of battery.

  Nithin

  • 1. once the S7 edge tells you it is fully charged, you can disconnect the charger. it is not necessary to put the phone on the charger after the battery is fully charged.

    2. if you really want (I do not recommend), you can disable fast charging in Settings -- battery. The adaptive charger will then work as normal wall charger with 2A output for your S7. As mentioned, it is not necesary to disable fast charging.

    Fast charging may affect battery life. But the impact is so marginal that you probably can ignore it.

  • I think the wall charger you are asking about is the adaptive charger inside the box. They're the same.

    • There are still many wall chargers without fast charging capabilities. And there are many middle-range smartphones without fast charging as well.

• Can you write real outputs in mA for following devices for s7 edge:
  1. adaptive wall charger(one that comes in box)
  2. adaptive car charger (EP-LN915UBESTA)
  3. fast wireless charger(EP-PN920TWEGUS)

  I tried few apps like ampere, battery monitor widget and on and they all give me approximately 1020mA for 1 and 2. for Samsung S7 edge. Is that correct reading?

  • Very likely, the reading is not accurate. You can simply do a quick math: Galaxy S7 edge battery has a capacity of 3600mAh. If the chagrining current is 1000mA, it would take you 3.6 hours to charge it from 0 to 100%. The actually charging time is half of it without using fast charging (in Galaxy S7 and S7 edge, you can disable fast charging and fast wireless charging if you want). If fast charging is on, is is even faster.

    The maximum real output is always marked on the charger. This is a legal (safety) requirements for all charger.

    The real current output for the first 2 chargers are very close to the maximum output current (2A) based on my calculations. I did not use special tools. I don't trust such apps. I did the math myself.

    For charger 1 and 2, output current is 2A. The first one usually charges slightly, yet consistently faster than the 2nd one. Both support fast charging (9V 1.67A).

    Charger 3 should use with an adaptive charger (e.g., charger 1). The output current is about 1.3-1.5A. If you use it with other normal 2A output charger (without fast charging), the output current is about 1A only.

• I have used my s7 from new 50% to 15% before charging it for six and a half hrs now i have been on it for an hour and fifteen and its down to 86% is that normal?

  • Something is wrong, if you are using the original charger and USB cable.

    Please check both ends of the usb cable and make sure they are inserted tightly.

• My phone usually takes 8 hours to charge each time, is that normal or a problem?

  • It is NOT normal. Using the official charger and cable, it should takes less than 2 hours to charge Galaxy S7 edge. (Less than 1.5 hours for S7).

    You may check whether you insert the USB cable tightly in both ends.

• Hi, i charged my s7 edge for the first time but the LED just blinked red for a second then keep blinking blue till it reached 100% then i saw a message "fully charged" and LED blinked green once only then turned blinking blue again. I consumed some battery and restarted the phone and tried to charge it once again then everything went fine, LED was steady red while charging and turned green when it reached 100%. Was it normal? Kinda worried about the first charge maybe i got a defective phone. Thank you.

  • Blinking blue usually means there are some notifications.

• what is the required battery percentage that the phone needs to be recharge?

  • There is no such a requirement for Galaxy S7 battery. But you should not use the battery to 0 to often. When battery levels reach 15%, you should get a notification. That's just a reminder for you.

    It's better to project your battery usage and schedule the charging.

• Hi, I'm considering getting a car charger/fm radio transmitter for my phone (14 year-old car doesn't have auxiliary audio input), and I'm just wondering if the voltage and amp limit is the same for car chargers as it is for your standard wall charger?

  Or, should I just stick with Samsung-approved chargers for everything?

  Sorry if I failed to describe the situation well enough. If it needs reiteration, let me know. Thanks ahead of time.

  • Any branded 5v car charger should work. Galaxy S7 can take up to 2.1A current.

• Whats gonna happen if i left my s7edge charging overnight? Will it damage the phone? Thanks

  • It's OK. If it's convenient, you can try to disconnect the charger. If not, just leave it.

• I tried fast wireless charging on my galaxy s7 edge but it only shows standard charging. I went into settings, clicked on battery and there is no option to turn on fast wireless charging. It only gives me the option to turn on or off fast cable charging. Is there another area In the settings where fast wireless charging is available?

  • Where did you get the fast wireless charging pad?

    Fast wireless charging requires: 1). fast wireless charging pad; and 2). adaptive wall charger (not normal wall charger).

    Once fast wireless charging is working, you will see a notification on it. Also, in Settings --battery, you can also see the option to enable/disable fast wireless charging. If you do not see the option, it simply means your wireless charging pad is not recognized as "fast" wireless charging pad. Check with the seller.

    • I have the same issue, in my settings I do not see an option for enable/disable fast wireless charging only turn on and off fast cable charging

      • After you connect S7 to the fast wireless charger first time, the option will be available.

        If you cannot see the option, it means your S7 has never connected to a fast wireless charger.

• An interesting and informative read. But what about battery calibration. Does the S6 and S7 batteries need any sort of calibration? Samsung has no mention of this and only read about it on blogs which may not be accurate.

  • It's not necessary to calibrate Galaxy S7 battery. So it's not necessary to use up the battery. Non-removable battery design allows Galaxy S7 to get more accurate battery info.

• I charged my s7 with adaptive fast charging the first time i did it only took me an hour or so to fully charged it. But when i charged it the next day it took me 4 hours this worries me because it is longer than the usual charger and the fact that it should charge incredibly fast than the usual charger.. what can be the reason behind this?

  • Make sure the USB cable is inserted fully to the charger.

    • my new s7 was charging normally when i first got it, 5hrs to charge then I found this article. checked the cables took them out put them back and made sure they were fully inserted. Then it went to fast charging < 1hr.

      thanks

      • Thank you for sharing your experience. It will help other S7 owners.

• I bought a new vehicle with wireless charging..does the s7 edge work with these

  • What standards does it support? Galaxy S7 supports both Qi and PMA wireless charging standards.

• Great battery guide! Cheers