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This review is from: Flip Video Battery Pack for Select Flip UltraHD Video Cameras (Discontinued by Manufacturer) (Electronics)
Bought this for the Flip Ultra HD as a backup in case I was out and needed extra power. The battery lasts for a little over a hour of recording. Since the Ultra HD has 2 hrs worth of memory its a good idea to have a backup battery pack. Great to get that extra recording out of the way in case you dont have axcess to a computer. Battery only charges while inside the camera and has to be hooked to the computer(unless you have a Flip AC adapter. Overall a good extra accesory to have around.