I sure wish i knew how you went 12 hours, and still had 51% left.. I took mine off the charger at 6:00AM and at 6:30PM it was at 5%!! That, forced me to put it on the car charger.. I was using google navigator for about 4 hours straight, & the screen was on for the same amount of time. Set at 'auto brightness" sent about 60 text messages, had Facebook Widget running constantly in the backround, and checked email on two accounts about 25 times... I know that's considered Heavy Usage, but WHY am I NOT getting the same results as you.. I am not even close... Do you think i should send my Razr Maxx back, and get another new one??