Key Specifications/Special Features: We have more than 1000 models lithium polymer rechargeable battery for MP3, MP4, Bluetooth, GPS, digital phone, PDA and more, should you have any interest, your inquiry will be highly appreciated. Product model: XL 1500mAh 3.7V Single battery model: 803450 Single battery voltage: 3.7V Single battery capacity: 1500mAh Battery voltage range after combination: 3.0V~4.2V Battery pack power: 5.55Wh Battery pack size:8*34.5*53mm Charge and discharge times: >500 times