Looking for a rechargeable CR123 battery? The Ultralast ULCR123R Rechargeable Battery is what you need! This rechargeable battery is designed to work with the Ultralast ULCR123RK Smart Charger.. 3V CR123 rechargeable battery. Long-lasting. Lithium Manganese Dioxide (CR). For use with ULCR123RK Smart Charger. Carded