HTC OEM 2750 mAh Extended Battery (35H00149-01M) for HTC Thunderbolt (Free HandHelditems Sketch Universal Stylus Pen) HTC OEM 35H00149-01M 2750 mAh Requires Extra Battery Door to close properly Compatible with: HTC ThunderBolt 4G Free HandHelditems universal Stylus pen features Soft foamy tip and a 3.5mm headphone jack insert so you never lose your stylus.