Li-ion Rechargeable Battery 3.7V 4000mAh 18650 - 2 Count

Reliable Rechargeable Power for Tactical Flashlights & High-Drain Electronics

Keep your compatible flashlights and electronic devices powered with the UltraFire 18650 Li-ion Rechargeable Battery 2 Pack. Designed for high-drain applications, these 3.7V lithium-ion batteries feature a powerful 4000mAh capacity to provide dependable, long-lasting performance for tactical flashlights, emergency lighting, portable electronics, and other compatible battery-powered equipment.

Each battery is equipped with an integrated Printed Circuit Board (PCB) protection system that helps guard against overcharging, over-discharging, and excessive voltage, helping extend battery life while providing safe, reliable operation.

Whether you're replacing worn batteries or keeping spare rechargeable batteries on hand, this convenient two-pack offers dependable performance and excellent value for everyday use, emergency preparedness, and outdoor activities.

Features

• 2 Pack UltraFire 18650 rechargeable lithium-ion batteries

• 4000mAh high-capacity performance

• 3.7 Volt rechargeable power

• Built-in PCB protection circuit

• Protection against over-voltage and under-voltage

• High energy density for longer run times

• Designed for high-drain devices

• IEC tested for quality and performance

• Environmentally friendly rechargeable design

• Ideal for tactical flashlights and emergency lighting

Specifications

Battery Type: 18650 Lithium-Ion Rechargeable

Brand: UltraFire

Quantity: 2 Batteries

Voltage: 3.7V

Capacity: 4000mAh

Terminal Type: Button Top

PCB Protected: Yes

Charge Cycles: Approximately 500

Battery Shelf Life: Up to 3 Years

Dimensions: 66 mm x 18 mm

Weight: 26.5 g each

Color: Red

Cut-Off Voltage: 2.5V

Internal Impedance: ≤180 mΩ

Cycle Performance: Approximately 90% capacity after 400 charge cycles

Compatible With:

• Tactical LED Flashlights

• Emergency Lighting

• Portable Electronic Devices

• Power Tools

• Other compatible 18650 battery-powered devices

What's Included

• Two UltraFire 18650 3.7V 4000mAh Li-ion Rechargeable Batteries

Important Safety Information

Only use these rechargeable batteries with compatible devices and chargers designed for 18650 lithium-ion batteries. Always follow the manufacturer's charging and storage recommendations. Do not expose batteries to excessive heat, fire, water, or physical damage.

Frequently Asked Questions

Are these rechargeable batteries?

Yes. These are rechargeable 18650 lithium-ion batteries designed for repeated use.

How many batteries are included?

This package includes two UltraFire 18650 rechargeable batteries.

Will these work in tactical flashlights?

Yes. These batteries are designed for many compatible tactical LED flashlights and other high-drain electronic devices that use protected button-top 18650 batteries.

What is PCB protection?

PCB (Printed Circuit Board) protection helps protect the battery from overcharging, over-discharging, and excessive voltage, helping improve safety and battery longevity.

Can these be used for emergency preparedness?

Absolutely. Rechargeable 18650 batteries are an excellent addition to emergency preparedness kits, especially for powering compatible flashlights and emergency lighting.

Why purchase from SDP Inc.?

For more than 20 years, SDP Inc. has been providing trusted personal safety, tactical, and emergency preparedness products backed by knowledgeable customer service and dependable support before and after every sale.