As a side note, I've had my phone plugged into the seat back USB ports on a B5 for over an hour now and have successfully charged from 11% down to 7%...
Am I charging the bus, or are the chargers just that bad!
Wonder if it's got anything to do with the fact it's only putting out 4.2v, rather than the 4.7-5v I'd expect
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Plug Sockets/USB Not Working