Save 37%

UltraFire 3.7V Li-ion Rechargeable Battery

Write a review
Orders ship within one business day! Your satisfaction is guaranteed when shopping with
Family Self-Defense Store
of Las Vegas, NV!
List price: $5.99
You save: $2.24 (37%)
In stock

UltraFire 3.7V Li-ion Rechargeable Battery

The 3.7V Li-ion Rechargeable Battery is a Heavy Duty capacity 18650 battery for high drain devices. With tremendous capacity and value, the Ultrafire 4000mAh 18650 is a high-powered li-ion battery that is perfect for demanding electronics such as tactical LED flashlights. These batteries feature 3.7 Volts of power and a top-of-the-line 4000mAh capacity that will keep high drain electronics running longer than competing power sources. Combined with reliable manufacturing quality and bulk value pricing, the Ultrafire 18650 is one of the best deals when it comes to li-ion power.


Each Ultrafire 18650 is outfitted with a uniquely designed PCB (printed circuit board) that functions as the brain of the battery, regulating output and intake of electrical charge. Thanks to the circuit board the battery is always safe to use and charge, as it will cut off the battery if the voltage drops below 2.5V or exceeds 4.25V. You can rest assured that your battery will perform perfectly every time since it's PCB protected!


Battery Terminal Type: Button Top

Capacity: 4000mAh

Composition: Lithium-Ion

Nominal Voltage: 3.7V

Cut-off Voltage: 2.5B

Internal Impedance: Less than 180 Milli-Ohms

Cycle Performance: 90% of initial capacity at 400 cycles

Type: 18650 Li-ion Rechargeable Battery

Charge Cycles: 500

Color: RED

Dimensions: 66.0 mm x 18.0 mm

Weight: 26.5g

Battery Shelf Life: 3 Years

Brand: UitraFire

Compatible with: Battery appliances such as Emergency Lighting, Flashlights, Portable Devices, Power Tools.


  • 18650 Lithium ion Cylindrical Rechargeable Battery
  • Internal PCB protection prevents under-voltage (2.5V) or over-voltage (4.25V)
  • Higher energy density than competing rechargeable batteries
  • International Electrotechnical Commission (IEC) standard tested to ensure capacity, quality, and lifespan
  • Great for LED flashlights and high drain devices
  • Environmentally friendly
  • 100% Brand New


UltraFire 18650 4000mAh 3.7V Li-ion Rechargeable Single Battery


This UltraFire 3.7V Li-ion Rechargeable Battery will be delivered in 4 to 7 business days. If you wish to receive your purchase sooner, expedited delivery options are available when finalizing your purchase. Should you have any questions or concerns, feel free to contact us. Our courteous and efficient customer support team is always ready to serve you!

No reviews found


Family Self-Defense Store of Las Vegas, NV is proud to offer you the very best in safety, security, and self-defense products. Our deepest purpose as an organization is to serve security professionals, law enforcement, military personnel, fugitive recovery agents, and regular citizens. We appreciate you visiting our website!

Read more about Family Self-Defense Store.



Related Products

At the same price!