The Nitecore NL1840AW is a 4,000mAh rechargeable 18650 lithium-ion battery engineered as an all-weather power source, built to keep compatible Nitecore lights running reliably in extreme cold, wet, and high-altitude conditions.

Key Features:

• Capacity & Discharge: Built around a 4,000mAh Li-ion NMC cell rated at 3.6V (14.4Wh), the NL1840AW supports a continuous discharge current of 10A, providing stable, high-output power for demanding lighting setups.
• Cold-Weather & Altitude Performance: The standout feature of the NL1840AW is its resilience in harsh environments — it's rated to operate down to -40°C at altitudes of up to 10,000 metres, addressing the sharp capacity drop conventional 18650 cells suffer in freezing conditions.
• Reliability & Safety: The battery incorporates a built-in intelligent protective circuit and a pressure relief valve, guarding against overcharging, over-discharging, and short circuits for safer, longer-lasting use.
• Durability: Rated IPX6 for strong resistance against heavy rain, snow, and spray, the NL1840AW is well-suited to sustained outdoor use, though it should not be submerged.
• Dimensions & Form Factor: A protected button-top 18650 cell measuring 69.8mm x 18.6mm (±0.3mm) and weighing 51g, designed as a direct, ruggedised upgrade for compatible devices.

Because of its cold-weather resilience and rugged build, the NL1840AW is well suited for hillwalkers, mountaineers, and professionals working in cold-store, winter outdoor, or high-altitude environments who need dependable power when standard batteries fail.

Compatibility: Designed for the Nitecore UT6, HC60 UHE, and HC65 UHE headlamps and the MT2C Pro torch, with further compatible models to follow. It should also fit other torches and headlamps that accept a protected button-top 18650 cell of this length — check your device's battery compartment before ordering if unsure.

⚠ WARNING DO NOT use the battery if its wrapper is damaged. DO NOT store or transport the battery with metal objects to avoid short circuit. DO NOT discharge at below 2.75V or charge at above 4.2V. DO NOT use the battery if its discharge current does not match your product. DO NOT disassemble, puncture, cut, crush, incinerate or short‑circuit the battery. DO NOT expose the battery to water or fire, or store the battery in a confined area with a high temperature above 50°C (122°F).

FAILURE TO FOLLOW THE ABOVE INSTRUCTIONS MAY RESULT IN SEVERE BATTERY DAMAGE OR POSSIBLE EXPLOSION.

Please note: We are unable to accept returned batteries once they have been opened, so please ensure they are the correct cell for your device before ordering.

Please note all orders for individual batteries without a device are sent via Royal Mail 48 Tracked, and not Royal Mail 24 Tracked or Special Delivery. Due to shipping restrictions, we are unable to send individual batteries to the Outer Hebrides, Scottish Highlands and surrounding areas, Channel Islands and Northern Ireland. Please see our delivery page for further details.