Vortex Optics Riflescope Battery Holder CR2032 Be prepared with a back-up battery. Battery holder mounts conveniently on a Picatinny rail. Holds one CR2032 battery. This CR-2032 battery holder works for all Vortex illuminated riflescopes. Quick access and mounting with a coin, tip of bullet or tool of a similar size or shape. Retaining cable secures battery holder cap and prevents loss. Watertight, dustproof storage.