The Contour Rechargeable Battery is the perfect backup for an extra long day of shooting. Carry this rechargeable battery with you and you can get up to an additional 3 hours of record time. Getting the juice into this battery is easy. Just charge this Contour Rechargeable Battery using your USB cable with the ContourHD video camera. The last thing you want when you're about to head out on that final, perfect run is a low battery warning. Get the Contour Rechargeable Battery and keep recording.