That is a bummer. I have C1D2 and C2D1 amd it seems somebody made a mistake. The single battery unit is depleting the batery all the time (although only started to do this after several weeks), the dual battery unit has issues with charging through USB and it only charges at arpund 0.2A and jumping around. I tried to connect it to 1A phone charger, and to a usb cable plugged into a docking station. Here it gets interesting. If the device is "idle" and charging, the USB current fluctuates around 0.2A. if i start escribe and with no changes i just Upload settings to device, it charges at 1A. But, after a while it falls again to around 0.2A... Seems like the small board is somehow malfunctioning, but i am not going to send it back to China...