When connecting two Android phones via a cable, how can I choose which phone is charging which phone? E.g. when I connected a Samsung Galaxy S9 (Android 10) with a Google Pixel 6 (Android 12) via a male-to-male USB-C cable, the Google Pixel 6 got charged.
1 Answer
Under USB preferences, whichever device has Charge connected device as enabled is charging the other device.
Snapshot from Pixel 4a (Android 12) connected to and charging One Plus 7 (Android 10)
And the reverse (One Plus charging Pixel)
If you want to switch charging when connected, toggle the switch on any device and the selection on the other device gets reversed.
Edit: To address the comments, charging cannot be switched off on both devices. I couldn't find any documentation around this.
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If you want to switch charging when connected, toggle the switch on any device and the selection on the other device gets reversed seems less than ideal - what if you want no charging to take place at all?– Chris HDec 3, 2021 at 16:30
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@ChrisH: Then presumably you'd set it to "off" on both phones, instead of "on" on one or the other. Dec 4, 2021 at 2:21
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@PeterCordes that's what I'd hope to happen, but "toggling one reverses the other" means that when you turn one off the other turns on– Chris HDec 4, 2021 at 11:38
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Regarding charging not being able to be switched off completely on both, I bet this has something to do with USB certification. There are all kinds of seemingly odd edge cases involved there, and it would not surprise me if one o them is ‘no data transfer without power transfer’. Dec 5, 2021 at 13:22