Nitecore 21700 Li-ion Battery 4000 mAh

Li-ion 21700 4000 mAh Nitecore batteries – Enhanced autonomy for high-performance lights and devices

The Nitecore 21700 format lithium-ion rechargeable batteries are designed for all users who power tactical lights, hunting lights, portable chargers, or any device requiring a stable and long-lasting energy source. The 21700 format, slightly larger than the standard 18650, offers a higher volumetric capacity, which directly translates into longer periods of use between charges.

Nitecore is a well-known brand in the world of high-performance batteries and rechargeable cells, with particular attention paid to discharge consistency and cell protection. Nitecore 21700 batteries generally incorporate electronic protections against overcharging, over-discharging, and short circuits, making them suitable for intensive and repeated use without prematurely degrading the cell.

The 21700 format with a capacity of 4000 mAh is particularly well suited to professional headlamps, high-brightness handheld lights (models exceeding 1000 lumens), and devices that consume more energy than a standard 18650 battery can provide over time. The user thus extends the lighting duration without having to interrupt their activity to recharge.

Charging these Nitecore 21700 Li-ion batteries is done via a charger compatible with the 21700 format, available in the Nitecore range. The nominal voltage of 3.6 V to 3.7 V is standard for this type of cell, ensuring broad compatibility with torches and equipment designed for this format. It is recommended not to mix batteries of different capacities or brands within the same multi-cell device, in order to preserve the charge balance.