the one with bigger electric potential charges the other one until they have the same one 
:missingtrollemoji:
When you plug two phones into each other, how do they decide which one charges the other?
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Yeah, that's the exact opposite of what I'm observing right now. :)
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Roshambo.
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Apparently, there's a protocol for thathttps://www.androidauthority.com/usb-power-delivery-806266/ …
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If I remember correctly, the first one plugged in will provide power, and the second will receive. Unless the first one decides it is too low to provide, then it will stop. Then they might renegotiate and charge the other way.
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Inception
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If it's usb-c the answer is usually: it depends. With devices like phones, they can be either the master of the connection or the recipient. There should usually be some GUI somewhere to let you change what's happening. It's also possible someone didn't implement this behavior =/
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People don’t know this but they actually have a thumb battle.
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If you plug cheap powerbank into itself it blinks as if it's charging itself :)
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