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Note that the critical point being warned about is the use of USB chargers/charging stations, as opposed to a USB connection to a computer.
AIUI, the Sony doesn't recharge unless it's sucessfully 'negotiated' with the charging device - again, AIUI, this is part of the USB protocol, ensuring that devices don't take more power than the chargers want to allocate them. A computer will support this but a basic 'USB power adapter' probably won't. Other devices might just ignore the failure & charge anyway, so you can't assume a charger does or doesn't support it if other devices work.
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