Use the charging block that came with the tablet. A phone charger wont work if you got them mixed up. Most phone charger have an output of 1.0 amps whereas a tab charger has an output of 2.0 amps. On a phone charger, the tab will say it's "charging" but the percentage won't move. In some cases it may even go down if you are watching a movie or something. Late answer but I hope it helps.