iPad only charges up to 1% and at that, only if charged from 0%
It sounds like its about time to buy a new cable and possibly an ipad charger. I go through cables all the time on my iphone/ipad. They always get frayed where the cord meets the lightning plug. 
Go to best buy and buy a new one, worst comes to worst, you can always return it. If the new cable doesn't work, its time to call apple and send it in for service.