Ipad Charging Issues

Ok so I am aware of the larger battery in the new Ipad and recognize it may take longer to charge but I have now come across a few issues where, using the original Ipad charger seems to charge up to about 88%, without even using it and when I checked it, it stated it wasn't charging. I unplugged and re-plugged the power cable and it started charging again. Since the device is not currently being used there should be no reason for it to not charge completely.  Just one more thing that makes me figure the existing power adapter simply isn't quite large enough for the new battery.