iRola DX752 does not charge after a while
This was my Christmas present to myself also.  It only charges with the 2.5mm plug on the AC Adaptor that was supplied with the tablet.  The mini-USB port and the supplied cable works well with transferring data, but cannot be used for charging.  I've tried different mini-USB cables, different AC wall plugs, but the mini-USB will not provide a charge.  At least the supplied AC charger works, but if it ever breaks, good luck in finding a replacement, as the Chinese manufacturer is hard to reach.

I have seen a car-charger adaptor kit from Radio Shack for $20, that will do the job from your car's cigarette lighter port.  Those are the only two options I've found so far.