I feel like the real problem is that fast charging wears out your battery faster, and the battery was already dying.

It definitely can’t negotiate 20V unless it had the hardware capability, and miscommunication between charger and device are almost impossible with USB PD.

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You might be right. I’m certainly no expert. It only responds when I get it into recovery mode, could it be an issue with the OS?

Probably a fucked battery or PMIC, recovery mode needs significantly less hardware to work than a full OS

My iPhone has been charging for an hour and is still on 5% so clearly I have something against my batteries.

Thanks for your help!