Streamlight SL-B50 Protected Li-Ion 4900 mAh USB Rechargeable Battery Pack with Integrated USB-C Charge Port The SL-B50 protected Li-Ion rechargeable battery pack is designed for select Streamlight products. The battery features a built in USB-C port and charge indicator. Features: - Use the SL-B50 battery pack to power the ProTac 2.0, ProTac 2.0 Headlamp, and the ProTac 2.0 Rail Mount - 3.6V, 4900 mAh, rechargeable at least 500 times - Charges in 6 hours using USB-C input - Battery charge status indicators around the port: Red for charging, green for charged - Integrated safety circuit protects batteries from overcharge/overdischarge Specifications: - Battery Type: Rechargeable Li-Ion - Maximum Voltage: 3.7V - Battery Capacity: 4900 mAh - Battery Quantity: 1 - Length: 3.26 inches (8.28 centimeters) - Weight: 3.00 ounces (85.05 grams)