The Galaxy S20's Wireless PowerShare is a must-use feature. With even the base model packing a 4,000 mAh battery, you have more than enough juice for all your Qi-enabled devices. The default settings make it so that in certain situations, you may have to choose between your phone or wireless earbuds, but you can change that.
There is a way to limit how low reverse wireless charging can drain your battery. This way, you never have to choose between your phone or your devices. Charge your earbuds or your friend's phone knowing that when you pick up your Galaxy S20, you'll still have more than enough battery for the rest of the day.
Open Settings and select "Device Care." Choose "Battery," then select "Wireless PowerShare." Besides the toggle to turn on and off this feature, there is only one other option, "Battery limit." This will let you adjust the threshold at which PowerShare will no longer charge other wireless devices.
By default, you can use Wireless PowerShare until your Galaxy S20 reaches 30%. However, to protect your battery life, select "Battery limit" and choose a higher percentage from the list. We recommend a battery percentage of around 50%.
That's all there is to it. Now, when you're charging another device and it takes your phone's battery down to that threshold, it will simply stop charging the other device.
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