Samsung D500 battery is the worst battery, the first day I got it after a full charge it died only 7 hours later after minimal use. I played some ringtones and scrolled through the menu and made 10 minutes worth of calls.But one of the old samsungs have good battery life a la the precolor screen samsungs.The Samsung E635 has a good battery life for the time I had it,but I doubt it since I only have had it for 2 days.