My phone has been off charger for 5 hours so far. I have used the phone for emails, texting, etc. I'm at 80% battery. The amazing part is the break down. 36% cell standby, 30% Bluetooth?, 28% Phone idle, 3% Wifi, 3% DISPLAY, 2% Andoid OS. I think I can tolerate the screen if it uses that little battery. Amazing! Brightness is at 25% which is plenty bright indoors.