Flip Video Battery Pack for 3rd Generation Flip UltraHD Video Cameras Rechargeable Li-ion Battery Pack is compatible with 3rd Generation Flip UltraHD video cameras (U32120 models) Recharges when connected to USB or to Flip Video Power Adapter Provides up to 1.5 hours of battery life for your Flip UltraHD video camera Note: Battery pack cannot be recharged outside of the video camera (such as with an external charger)