I was charging my phone the other night and accidentally left it charging for almost 3 hours. My phone usually takes about only 1 hour to fully charge. Now, I had heard that overcharging lithium ion batteries can gat damaged if overcharged. Does this mean that I may be possibly damaging my battery if I leave it plugged in for longer than it takes to fully charge? Also, I make it a habit to turn off my phone while charging. I just want to try and keep my battery in as good of a condition as possible.