YN4L 1700mAh battery for HTC Thunderbolt ADR6400; T-Mobile myTouch 4G + Dock Charger | Htc, Cell phone battery, Tmobile
Amazon.com: Gomadic Portable AA Battery Pack Designed for The HTC Thunderbolt 2 - Powered by 4 X AA Batteries to Provide Emergency Charge. Built Using TipExchange Technology : Electronics