Samsung Galaxy S20 Guides

Everything about Samsung Galaxy S20, S20+, and S20 Ultra

Qi Wireless charging

How to set battery limit for Wireless PowerShare on Galaxy S20, Note 10, and S10?

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set battery limit for Wireless PowerShare on Galaxy S20, Note 10, and S10Wireless PowerShare is a convenient feature allowing you to charge accessories with Galaxy S20 battery.

When the feature was first introduced in Galaxy S10, the battery limit for wireless Powershare is fixed at 30% (of the phone battery). In Android 10 update for Galaxy S10 and Note 10, Samsung allows owners to raise the battery limit for Wireless PowerShare.

Galaxy S20 also allows you to adjust the battery limit for Wireless PowerShare. And it works identically to Galaxy S10 and Note 10.

This Galaxy S20 guide shows you how to adjust the battery limit for Wireless PowerShare on Galaxy S20, S10, and Note 10. Some questions on setting the battery limit for Wireless PowerShare are also answered.

What is Wireless PowerShare on Galaxy S20?

Wireless PowerShare turns your Galaxy S20 into a Qi-wireless charger. So, you can use your Galaxy S20 to charge accessories and even other phones that support wireless charging.

The typical usage of Wireless PowerShare is to charge your smartwatch, earbuds (e.g., Samsung Galaxy Buds,  Galaxy Buds+) with your Galaxy S20’s battery. You can use it to charge other phones. But the speed is not so fast (it is the standard wireless charging. No fast wireless charging.)

Samsung first introduced this feature with Galaxy S10. It is one of a few well-received new features in Galaxy S10.  Galaxy Note 10 and Galaxy S20 implemented the wireless Powershare similarly.

A detailed guide on how to use Wireless PowerShare can be found here. It applies to all Samsung devices supporting Wireless PowerShare.

The original implementation of the Wireless PowerShare in Galaxy S10 and Note 10 hardcoded a battery limit of 30%. Wireless Powershare will stop automatically if the phone battery is lower than 30% of its full capacity.

Because the phone battery drains faster  (most of us can “feel” it) when the battery level is low,  some owners want to reserve more battery, especially when charging other phones. The 30% limit may be too low for them.

So, in Android 10 update, Samsung added the option for you to set battery limit for Wireless PowerShare on Galaxy S10 and Galaxy Note 10.  Galaxy S20 has this feature from day 1.

Please note some official Samsung Galaxy S20 cases, like Galaxy S20 LED View Cover, Galaxy S20 Clear View /S View Cover, and Galaxy S20 LED back cover, may affect wireless … Read the rest

What is fast charging, super-fast charging, fast wireless charging and fast wireless charging 2.0?

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What is fast charging, super-fast charging, fast wireless charging and fast wireless charging 2.0?Samsung bragged a lot about fast charging and super-fast charging for Galaxy S20, S20+, and S20 Ultra.

But these are not industrial standards, although there are some industrial standards behind.

So, as an owner of Galaxy S20, you may be confused with the Qualcomm quick charge (QC)  or USB power delivery.

This Galaxy S20 guide explains the meaning of fast charging, adaptive fast charge, super-fast charging, fast wireless charging, and fast wireless charging 2.0, and the link to industrial standards.

What are fast charging, adaptive fast charging, and super-fast charging on Galaxy S20?

Before you charge Galaxy S20 battery, you may need to understand some jargons used on “fast” charging.

The old USB charger usually charges up to 5W (5V, 1A). The fast USB charging usually refers to charging up to 10W (5V, 2A).

But Samsung coined “adaptive fast charging” for charging up to 15W (9V, 1.67A) since Galaxy S6. Up to Galaxy S10, the 15W adaptive fast charger had been bundled with Galaxy S and Note devices.

Adaptive fast charging supports both 10W USB fast charging, and 15W proprietary fast charging. The 15W fast charging can be activated only when the battery level is lower than about 60%.

Samsung minted “super-fast charging” when Galaxy Note and Note 10+ were announced last year. It refers to up to 25W charging for Galaxy Note 10, and up to 45W for Galaxy Note 10+.

Galaxy S20 and Galaxy S20+ support super-fast charging up to 25W, and Galaxy S20 Ultra up to 45W, as explained in the differences among Galaxy S20 models.

Adaptive fast charging and super-fast charging were not industrial standards. Samsung minted them.

The industrial standards related to USB charging for phones have two different sets:

  1. Qualcomm Quick Charge (QC). All Samsung devices, including Galaxy S20, only support QC 2.0. FYI, the latest version is QC4+. Probably due to licensing cost for Samsung’s Exynos chips used in some regions, Samsung chose not to support QC 3.0 or QC4 on all their phones including those with Snapdragon chips.
  2. USB Power Delivery (PD). USB PD became popular with the wide adoption of USB-C, although USB PD does not rely on USB-C. Also, there are no licencing fees involved.  Samsung does not explicitly state the support of USB PD. But Galaxy S20 did get the fast USB charger certificate from
… Read the rest