I noticed that if I charge my iPad 2 when its at 10% or lower it takes about 10 hrs or so to be at 100%. If I plug it in at 30%'ish, it only takes a few hours. I'm still testing and will try charging at 20%'ish to see how long it takes. I've had this iPad for 3 years and have went down to under 10% before and charging never took this long. Anyone experience this? Is this fixable?