Flip Video Battery Pack for Flip Ultra and UltraHD Video Cameras U1120, U2120, U260 (Discontinued by Manufacturer) Rechargeable NiMH Battery Pack is compatible with Flip Ultra (2nd Generation) and Flip UltraHD Camcorders Provides 4.5 hours of battery life for your Flip Ultra (2nd Generation) and 2.5 hours for your Flip UltraHD Camcorder Recharges when connected to USB or to Flip Video Power Adapter Convenient alternative to AA batteries Note: Battery pack cannot be recharged outside of the camcorder (such as with an external charger)