Streamlight SL-B9 Li-Ion USB Rechargeable Battery Pack w/ Integrated USB-C Port 8 Pack. It offers an economical alternative to a disposable CR123A cell for Streamlight flashlights that are designed to accept both. The integrated USB-C charge port features LED status indicator lights and can recharge the battery within 2.5 hours. The SL-B9 battery pack can be recharged by any Streamlight USB power adapter or most other USB power sources. Specifications for Streamlight SL-B9 Li-Ion USB Rechargeable Battery Pack w/ Integrated USB-C Port: Manufacturer: Streamlight Battery Quantity: 100 Battery Capacity: 850 mAh Power: 3.6 volts Diameter: 0.67 in Length: 1.36 in Weight: 0.7 oz Battery Type: Lithium-ion Rechargeable Features of Streamlight SL-B9 Li-Ion USB Rechargeable Battery Pack w/ Integrated USB-C Port Protected lithium-ion rechargeable battery pack: 3.6V 850mAh with on-board safety control circuit rechargeable up to 300 times Integrated USB-C charge port Charges in 2.5 hours Charge status indicator built into the top of the battery - Red: Charging; Green: Charged Package Contents: Streamlight SL-B9 Li-Ion USB Rechargeable Battery Pack w/ Integrated USB-C Port Streamlight 20238: SL-B9 Li-Ion USB Rechargeable Battery Pack w/ Integrated USB-C Port 8 Pack