2016-01-07, 03:33
Hey, it has happened to me too. I noticed that both batteries discharge completely and do not charge while connected to USB on "Media device (MTP)" mode, even though it shows they are charging. Also, on some ROMs earlier than 3.0, it used to discharge the internal battery first when connecting it this way to the PC. The phone does not work with a flat internal battery. The only solution that seems to work for me is to charge the phone using the provided wall adapter not with the USB ports on my PC. Hope that helps.