about 80%. I unplugged it at 340pm. 4G off, auto brightness, wifi on for an hour, GPS on, BT off. Facebook and twitter sync every 4 hours, newsrob every hour, remember the milk every 4 hours, friend stream every day, stocks every 4 hours, weather every hour. During that time I browsed the web for half an hour, sent some texts, used google maps, and a couple phone calls, took a pic and a min long 720p video, and ran a speedtest. Looks like the stock battery is pretty adequate, but I still ordered the seidio one. Oh, I did plug it in to the computer for 2 min to transfer a video.