Streamlight SL-B50 3.6V 4900mAh USB-C Rechargeable Li-Ion Battery - 2-Pack

The Streamlight SL-B50 is a protected Lithium-Ion rechargeable battery pack rated at 3.6 Volts with a 4,900 mAh capacity, designed as the dedicated power source for the Streamlight ProTac 2.0 family of flashlights and headlamps. An on-board safety control circuit protects the cell, and the pack is rated for at least 500 recharge cycles over its service life.

Charging is handled through a built-in USB-C port on the side of the pack, with a full top-off taking roughly 6 hours. An LED indicator ring around the port shows charging status at a glance: red while charging and green when fully charged, so you know the moment the pack is ready to slide back into the host light.

This listing is a 2-pack of single SL-B50 batteries, giving you a fresh spare pack on hand to swap into your ProTac 2.0 light the moment the primary cell is exhausted or still sitting on the charger. Each pack measures 3.26 inches long with a 0.905-inch maximum diameter and weighs 3.00 ounces, finished in silver and black to match the host light.