Our Russian brothers at a320emulate.su have posted this great Google translated tip on how to fix Dingoo A320 charging issues:
Users often complain Dingoo A320 problems with charging. Of the symptoms can be listed as follows:
Do not hurry to flee for a new battery. As recently as today, I personally have seen this - decided it is very easy. Use chunky cable USB-miniUSB. In my case, all issues decided by replacing the cable to the short cord from the USB-modem.