The Nitecore NL2140 21700 Li-ion battery features a long lifespan, high energy density and powerful performance. The cell has a 4000mAh capacity, 3.6V and 14.4Wh.

Nitecore batteries have a range of safety features to ensure your safety when in use, plus that of your other devices and chargers.

Internal safety features include:

• Innovative anode design with high temperature resistance
• Built-in PTC to inhibit high current surges
• Pressure relief valve which activates in the event of a rapid temperature increase
• A microporous barrier that protects the delicate internal components.

External safety features include:

• Nickel-plated stainless steel protectors at both ends to ensure high impact resistance, good electrical conductivity and oxidation resistance
• Coated with a durable metallic film to guard against abrasion
• Tough plastic circuit board protector

The 21700 is recommended to use with the following Nitecore chargers: UI1, UI2, UM2, UM4, UMS2 and UMS4.

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 individual batteries to the Outer Hebrides, Scottish Highlands and surrounding areas, Channel Islands and Northern Ireland. Please see our delivery page for further details.