Nitecore NL1840AW 4000mAh 18650 All-Weather Rechargeable Battery Extreme Cold -40°C

The Nitecore NL1840AW is a 4000mAh Li-ion NMC 18650 all-weather battery specifically engineered for extreme Canadian winter conditions. Unique on the market, it maintains efficient discharge performance down to -40°C (-40°F) and operates reliably at altitudes up to 10,000 meters, where conventional batteries lose all capacity. With a 10A continuous discharge current, it is optimized for high-powered flashlights and headlamps like the UT6, HC65 UHE and MT2C Pro. Alpine skiing, cross-country skiing, snowmobiling, winter quad riding, fatbiking, ice climbing or snowshoeing: the NL1840AW is the battery for Canadian adventurers who don't stop when temperatures plunge.

Extreme Cold Performance and Longevity

The NL1840AW integrates a Li-ion NMC (Nickel Manganese Cobalt) chemistry specially formulated to maintain performance in the coldest environments. Its 10A discharge current powers the most demanding flashlights without performance drop. With over 500 full recharge cycles, it retains more than 80% of its original capacity, representing a durable and cost-effective investment for intensive users. Its built-in intelligent protective circuit prevents overcharging, over-discharging and short circuits. A pressure relief valve activates in case of rapid temperature increase for maximum safety.

All-Weather Construction and IPX6 Rating

The NL1840AW stands out for its build quality: its nickel-plated stainless steel protectors at both ends ensure impact resistance, optimal conductivity and oxidation protection. A durable metallic film protects against abrasion in demanding outdoor environments. Mercury-free, lead-free, cadmium-free for safe use and storage. At only 51g for 69.8mm × 18.6mm, it fits all 18650-compatible devices for unlimited winter adventures.

⚠️ Safety Warnings

• DO NOT use if the outer shell is damaged
• DO NOT store or transport with metal objects
• DO NOT discharge below 2.75V or charge above 4.2V
• DO NOT disassemble, pierce, cut, crush, incinerate or short-circuit
• DO NOT expose to water or fire, or store above 50°C (122°F)

Failure to follow these instructions may cause serious damage or explosion.

Specifications

• Li-ion NMC 18650 all-weather rechargeable battery
• Capacity: 4000mAh 3.6V (14.4Wh)
• Continuous discharge current: 10A
• Operating temperature: down to -40°C (-40°F)
• Maximum altitude: 10,000m
• Recharge cycles: 500+ full cycles
• Chemistry: Li-ion NMC (Nickel Manganese Cobalt)
• Protection: Overcharge, over-discharge, short circuit, pressure relief valve
• Protectors: Nickel-plated stainless steel (both ends)
• Anti-abrasion film: Yes
• Mercury free, lead free, cadmium free
• Compatible: UT6, HC65 UHE, MT2C Pro and 18650-compatible devices
• Dimensions: 2.75" / 69.8mm±0.3mm (L) x 0.73" / 18.6mm±0.3mm (diameter)
• Weight: 1.80oz / 51g
• Waterproof rating: IPX6

Box Contents

• 1 NL1840AW 4000mAh 18650 Battery

FAQ - Frequently Asked Questions

What is the difference between the NL1840AW and the NL1840R? The NL1840AW is rated for operation down to -40°C and uses an NMC Li-ion chemistry optimized for extreme cold. The NL1840R features a built-in USB-C port for direct recharging but is not rated for extreme cold. Choose the NL1840AW for Canadian extreme winter conditions.

Why does this battery perform better in cold weather? Conventional Li-ion batteries lose 20 to 50% of their capacity below -10°C. The NMC chemistry of the NL1840AW maintains efficient discharge performance down to -40°C, ensuring reliable lighting during winter outings across Canada.