Streamlight SL-B50 USB Rechargeable Battery (1-Pack)

The Streamlight SL-B50 USB rechargeable battery is a protected lithium-ion power cell built for select Streamlight tactical lights and headlamps. If you run Streamlight gear in the field—whether that's a ProTac 2.0 headlamp for hands-free work or a rail-mounted light on a rifle or shotgun—the SL-B50 eliminates the need to constantly buy disposable batteries. A single charge lasts through serious use, and the battery recharges at least 500 times over its lifespan, making it a practical and economical choice for hunters, shooters, and outdoors folks who depend on reliable illumination.

The USB-C charging port means you can top up the SL-B50 using any standard USB-C charger or power bank—convenient when you're in camp, at the range, or between trips. A full charge takes about 6 hours, and the integrated status indicators (red while charging, green when full) let you know exactly where your battery stands. Built-in safety circuitry protects against overcharge and overdischarge, so you don't have to babysit the charger or worry about damaging the cell.

At just 3 ounces and under 3.3 inches long, the SL-B50 is compact enough to stash in a pack or vest pocket without taking up real estate. If you've invested in Streamlight's modern rechargeable lights, this battery is the backbone that keeps them ready to go.

Key Features

• Protected lithium-ion cell—500+ recharge cycles for long-term reliability
• USB-C charging port works with standard chargers and power banks
• Built-in charge indicators: red light shows charging status, green indicates full charge
• Integrated safety circuit prevents overcharge and overdischarge damage
• Compact and lightweight—3 ounces, fits easily in field packs or gear bags
• Compatible with ProTac 2.0 headlamp and ProTac 2.0 rail-mount light

Specifications

Frequently Asked Questions

What Streamlight lights does the SL-B50 work with?

The SL-B50 is designed for the ProTac 2.0 headlamp and the ProTac 2.0 rail-mount light. If you own other Streamlight models, check the light's manual or contact the manufacturer to confirm compatibility before ordering.

How long does it take to charge the SL-B50?

A full charge takes approximately 6 hours using any standard USB-C charger or power bank.

How many times can I recharge this battery?

The SL-B50 is rated for at least 500 recharge cycles, so it will serve you reliably for years of field use before performance degrades.

What's included in the package?

You receive one SL-B50 rechargeable battery pack. The battery ships as a 1-pack.