SureFire SF18650B 3.6V 3500mAh Rechargeable Li-Ion Battery with Micro USB Charging

The SureFire SF18650B 3.6V rechargeable lithium-ion battery is built for shooters and outdoor professionals who depend on high-drain tactical lights and electronic gear. This 18650 cell delivers 3,500 mAh capacity with an 8–10A discharge rate, so you get reliable runtime whether you're running a weapon-mounted light through a low-light course, a handheld search beam on a night hunt, or any other mission-critical application. Unlike older proprietary charging systems, the SF18650B uses standard Micro-USB charging—plug it into any wall adapter, power bank, laptop, or vehicle charger you already own.

If you've been tethered to dedicated charging cradles, the convenience here is real. The included Micro-USB to USB cable lets you top up anywhere, and dual LED indicators show you the charge state at a glance: red while charging, green when full. That simplicity means fewer cables in your pack and faster turnaround between range sessions or field work. The 3,500 mAh rating gives you the extended runtime you need from demanding flashlights and tactical equipment.

SureFire engineered the SF18650B to replace its older SF18650A in their most popular lights, and it's forward-compatible with a wide range of modern tactical tools. Whether you're upgrading a FURY-DFT, M600DF, or other SureFire fixture that accepts 18650 cells, this battery simplifies your power management without sacrificing dependability.

Key Features

• 3.6V, 3,500 mAh lithium-ion cell for extended runtime in high-drain lights and devices
• 8–10A discharge rate handles demanding tactical and outdoor applications
• Micro-USB charging port—use any standard USB power source, no proprietary cradle required
• Included Micro-USB to USB cable for immediate charging flexibility
• Dual LED charge indicators: red (charging), green (full)
• Replaces SureFire SF18650A in most compatible fixtures

Specifications

Frequently Asked Questions

What SureFire lights and devices will this battery work with?

The SF18650B is designed as a drop-in replacement for the discontinued SF18650A and is compatible with SureFire's 18650-based lights, including the FURY-DFT, M600DF-BK, and M600DF-TN. Confirm your specific fixture's compatibility with SureFire or check your device manual to ensure it accepts 18650 cells.

What's included with the battery?

The SureFire SF18650B comes with a Micro-USB to USB charging cable, so you can charge immediately from any USB power source—wall charger, power bank, laptop, or vehicle port.

Do I need a separate charging cradle?

No. The SF18650B charges via Micro-USB cable, eliminating the need for a proprietary charging cradle. The included cable plugs into any standard USB power adapter or device.

How long does the battery run in a tactical flashlight?

Runtime varies depending on the specific light model and brightness setting. The 3,500 mAh capacity and 8–10A discharge rate are designed for extended use in high-drain devices. Consult your flashlight's manual for estimated runtime figures.