It has BL-5J 3.7V 1320mAh battery. It has an operating time as follows: * GSM Talk Time up to: 8.5 hours. * GSM Standby Time up to: 17 days. * WCDMA/3G Talk Time up to: 6.0 hours. * WCDMA/3G Standby Time up to: 18 days. * Video Playback Time up to: 3.6 hours. * Video Recording Time up to: 3.5 hours. * Video Call time up to: 2.7 hours * Music Playback Time up to: 35.0 hours.