Introducing the BD 1800 Rechargeable Battery, a groundbreaking advancement in modular rechargeable battery pack technology. Engineered to seamlessly integrate with the Sprinter 500 and ReVolt 350, this innovative battery boasts a robust 1800 mAh Lithium Ion rechargeable cell, providing you with dependable light for your adventures in the mountains, whether you're running, climbing, or trekking. The charger is not included with this battery.