I recently purchased a tab 3 10.1 from a friend. The tablet would give the % of battery and say charging even though it was not hooked up to a charger. Also the charger was extremely hot. I called samsung and returned it to them for repair. I just got an email from them saying nothing was wrong with the tablet. I have had a computer business for 20 years and I'm pretty sure I'm right. I did a hard reset on it also and it didn't matter. Any ideas?