The slim extended battery does not require the use of a replacement door and provide more battery life than the stock battery, depending on individual usage. Preimum Quality,and Durability! Produced under high quality standards Cell: Lithium Ion Voltage: 3.7V Capaticy: 1700mAh What's Included: 2- 1700mAh HTC ThunderBolt/ myTouch 4G Replacement Battery (Red) 1- Mini Bluetooth Dongle (Supported Operation system : Windows 98, 98SE, ME, 2000, XP, VISTA) Note: ** All battery life claims are dependent upon usage patterns, network configuration and many other factors; actual results will vary. To obtain the full capacity of your battery, leave the battery/your phone on the charger for an additional 2-3 hours after the charging indicator turns green or the battery status shows full. **
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