I left my 8.4 charged with the wall charger over night, in the morning I found it's only 94% full, this happened multiple times, and I also tried another wall charger it still happened. The battery chart shows it stopped at 94% (some times 95%) and never went up. Does anybody has the same problem? Is there anything wrong with the battery? BTW, the battery life is not good for me, screen on for only 5-6 hrs on about 30% brightness.