As I experienced the same problem, I just wanted to reword Sony's answer, to make things even more clear. My new Z3 Compact was not charging in either of the two USB ports of my car (a recent French Peugeot) which are managed by the on-board entertainment system (for playing MP3s and viewing JPEGs). I changed the Android USB port setting from MTP (which is useful when connected to a PC) to the older MSC mode and it now charges. My summary of the situation is the following: - If the Z3 is configured for MTP, - And if it finds some intelligence at the end of the USB cable (not just a dumb charger), - But it doesn't find MTP, Then it doesn't charge.
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