Don't leave epic lines unrecorded due to a dead battery. Carry the VholdR ContourHD battery with you for a few extra hours of film. Use your spare battery to continue recording the action. Get up to an additional 2 hrs (VholdR) and up to 3 hrs (ContourHD) of record time. Recharge using your USB cable with your ContourHD or VholdR Helmet Cam.