I bought a Samsung Droid Charge and battery life barely last 10 hrs with Wi-Fi and GPS turned off. I have the display set at 1 minute. But I don't use the phone that much during the day. The battery usage say it is the display that has used the maximum amount of power but the brightness is set to a very minimal level. Email notifications are set to every 15 minutes. The only thing left is to turn off mobile data.