I took it off the charger yesterday around noon and at about midnite last night after 12 hrs off the charger with moderate use txting and facebooking and some other internet use I was at 60% battery. I had it laying on the couch and left the room for a minute and when I came back the phone had rebooted and was loading up. Once it came back on the battery said 100%. So I left it off the charger all night to see if it would recalibrate the battery back to a accurate reading. It also reset the timer on the time it said off the charger. So as of right now after being off the charger for 12 hrs yesterday and then rebooting and then staying off the charger all night last night and all day today with moderate use, my extended battery is going on 36+ hrs without being charged at moderate use.