I was having an issue where even when plugging in my tablet using a cell phone charger it wouldnt take charge, but the blue LED would come on to indicate it was getting power. Turns out the issue is the charger I was using wasn't providing sufficient power. I looked on the tablet and saw it required a charger that provides 5 volts at between 1.5 and 2.0 amps; the charger I was using was only providing 5 volts and 1.2 amps. When I plugged in with a charger providing 1.6 amps it immediately displayed the battery charging icon on the screen and allowed me to power the tablet on like normal.