Flashpoint Replacement Battery for the Pure Digital Technologies Flip Ultra, 2nd generation & Flip UltraHD Camcorders Replacement Rechargeable NiMH Battery Pack compatible with Flip Ultra (2nd Generation) and Flip UltraHD Camcorders Will Recharge when connected to USB or to Flip Video Power Adapter Will Provide 4.5 hours of battery life for your Flip Ultra (2nd Generation) or 2.5 hours for your Flip UltraHD Camcorder A Convenient, eco-friendly alternative to AA batteries Please Note: The battery pack CANNOT be recharged outside of the camcorder (such as with anexternal charger)