I got it from my friend a few days ago, and did a factory reset on it. It was fine before that, now, even if it's 100 percent charged, it will still die after maybe 5 to 10 minutes of constant use. Once I plug it back in, it always says it has around a 60 percent charge. I can't figure out if it was the reset that did it, or the battery. Can anyone shed any light on the subject?