The NiteCore Nl2140 21700 Li-Ion battery has, with 4000 mAh, a lot of power. Thanks to its powerful performances you know that this battery will continue to function. A 21700 Li-Ion battery is twice as powerful as a regular 18650/ 2300 mAh-battery. Please note, however: a 21700 battery is not a replacement for the 18650 battery. This battery can only be used in various flashlights that were specifically designed for this type.
Emergence of the 21700 Li-Ion battery
This battery was introduced by the electric car industry. Because of its long life span, high energy density and powerful performances, however, these electronics also ended up in the flashlight market. Today more and more flashlights are developed that are enhanced with a 21700 Li-Ion battery. All these batteries are enhanced with a protective circuit. With it the cells are protected from overcharging, over-discharging and short-circuiting.
Tip for using the NiteCore NL2150
Some people say: 'I take good care of my batteries, I charge them as little as possible!' In the case of Lithium Ion batteries that is not the right thing to do. These batteries will last a whole lot longer if you charge them on a regular basis.