Image unavailable
Streamlight SL-B50 Lithium Ion USB-C Battery
Our editorial team reviews specifications, product data, and field-use information to keep pages accurate.
$34.99
View on Sportsmans Guide
You'll be taken to Sportsmans Guide to complete your purchase.
Hunter's Outpost earns a commission from affiliate links at no extra cost to you.
SKU: WX2*0734107
Overview
This rechargeable battery is built to keep compatible Streamlight ProTac 2.0 lighting systems ready for extended use in the field or on duty. It uses a USB-C charging port, so there is no charger cradle needed, and it is rated at 3.6V / 4900mAh for extended runtime. LED power status indicators help you monitor charge level, while the integrated safety circuit is designed to protect against overcharge and discharge. It is rechargeable at least 500 times, making it a practical option for users who rely on their light regularly.
Why Hunters Choose the Streamlight
Compatible Protac
ProTac 2.0, ProTac 2.0 Headlamp,
Usb-c Charging
Port eliminates the need for
3.6v /
4900mAh capacity supports extended runtime
Led Power
Status indicators show battery charge
Integrated Safety
Circuit protects against overcharge and
Key Features
- Rechargeable Streamlight SL-B50 lithium ion battery for compatible ProTac 2.0 models.
- USB-C charging port; no charger cradle needed.
- 6-hour charge time for convenient recharging.
- 3.6V / 4900mAh capacity for extended runtime.
- LED power status indicators show battery condition.
- Integrated safety circuit helps protect against overcharge and discharge.
- Rechargeable at least 500 times.
Best Used For
- Hunters using ProTac 2.0 lights who want a rechargeable battery with USB-C charging convenience
- Field users needing a spare power source for extended runtime during long nights outdoors
- Anyone who prefers battery status indicators for quick checks before heading into the field
- Users replacing disposable batteries in compatible Streamlight systems for repeated recharge cycles
- Hunters and shooters wanting a no-cradle charging option for simpler gear management
Specifications
| Battery Type | Lithium Ion |
|---|---|
| Capacity | 4900mAh |
| Charge Time | 6 hour charge time |
| Charger Cradle Required | No |
| Charging Port | USB-C |
| Compatibility | ProTac 2.0, ProTac 2.0 Headlamp, ProTac 2.0 Rail Mount |
| Power Status Indicators | LED |
| Rechargeable Cycles | At least 500 times |
| Safety Circuit | Integrated safety circuit protects batteries from overcharge/discharge |
| Voltage | 3.6V |
Pros
- Compatible with ProTac 2.0, ProTac 2.0 Headlamp, and ProTac 2.0 Rail Mount.
- USB-C charging port eliminates the need for a charger cradle.
- 3.6V / 4900mAh capacity supports extended runtime.
- LED power status indicators show battery charge condition.
- Integrated safety circuit protects against overcharge and discharge.
- Rechargeable at least 500 times for repeated use.
Considerations & Trade-offs
- Compatibility is limited to ProTac 2.0, ProTac 2.0 Headlamp, and ProTac 2.0 Rail Mount systems, so it is not a universal replacement battery.
- A full charge takes about 6 hours, which may require planning if you rely on the light for back-to-back outings or long shifts.
- USB-C charging is built into the battery, but it still requires access to a USB-C power source rather than a dedicated charger cradle.
- The battery is rated for at least 500 recharge cycles, so long-term use will still depend on charging habits and storage conditions.
Suggested Comparisons
- Rechargeable flashlight batteries
- USB-C charging accessories
- Headlamp power accessories
- Rail-mounted light batteries
Suggested Accessories
- USB-C charging cable
- Flashlight battery charger
- Spare flashlight battery
- Battery storage case
Frequently Asked Questions
Which Streamlight lights is the SL-B50 battery compatible with?
It is listed as compatible with the ProTac 2.0, ProTac 2.0 Headlamp, and ProTac 2.0 Rail Mount.
How is the SL-B50 battery charged?
It charges through a USB-C charging port, and no charger cradle is needed.
How long does it take to charge the SL-B50 battery?
The listed charge time is 6 hours.
What are the battery specifications?
The SL-B50 is listed at 3.6V / 4900mAh.
Does the battery include any safety or status features?
Yes. The product data lists LED power status indicators and an integrated safety circuit that protects against overcharge and discharge.