Nitecore NL2155 21700 5500mAh 3.6V Li-ion Rechargeable Battery

On a night patrol deep in the backcountry, your flashlight is your lifeline. The Nitecore NL2155 21700 lithium-ion battery delivers the relentless power needed for high-drain devices like tactical torches, headlamps, and portable electronics. With a 5500mAh capacity and 8A continuous discharge, it sustains bright output and long runtimes, ensuring you're never left in the dark during extended shifts, night hikes, or emergencies.

Key specifications

• Battery type: Lithium-ion (Li-ion)
• Size: 21700
• Capacity: 5500 mAh
• Nominal voltage: 3.6 V
• Energy: 19.8 Wh
• Max continuous discharge current: 8 A
• Recommended charge current: 2 A
• Max charge current: 4 A
• Positive terminal: Button top
• Protection circuit: Integrated (overcharge, over-discharge, short-circuit, over-current)
• Cycle life: >500 cycles
• Operating temperature (charging): 0°C to 45°C
• Operating temperature (discharging): -20°C to 60°C
• Safety features: Pressure relief valve, porous barrier, PTC protection

Why choose it

Built with safety and reliability at its core, the NL2155 features an integrated protection circuit that guards against overcharge, over-discharge, short-circuit, and over-current. The pressure relief valve and PTC protection add extra layers of defense, while the high capacity means fewer battery swaps and longer runtimes. The button top design ensures broad compatibility with a wide range of devices.

Ideal use cases

• High-performance flashlights and headlamps
• Portable power banks and electronic devices
• Professional equipment requiring stable high-drain power
• Outdoor, tactical, and emergency preparedness kits

Good to know

For optimal performance and longevity, use a compatible charger and avoid exposing the battery to extreme temperatures. Always store in a cool, dry place and follow manufacturer guidelines for charging and handling.