It’s easy to share your charge with another phone.

Samsung is so confident in the Galaxy S10’s battery that it’s letting you give away some of your precious percentage points. A new feature called Wireless PowerShare lets you literally turn your S10 into a wireless charging mat so you can power up another Qi-enabled phone just by laying it on the back of the S10. It works on all three models. Here’s how to use it:
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https://www.pcworld.com/article/3341307/mobile/wireless-powershare-galaxy-s10-how-to.html