Used batteries/batteries used for testing in lightly used condition without original packaging. Batteries are charged and tested in flashlights to ensure their functionality. Batteries are shipped in a plastic battery organizer for safety.

Next-Gen 4000mAh 21700 Battery

The next generation 21700 rechargeable battery from Nitecore, the NL2140 has an amazing 4000mAh capacity. This powerful battery has improved performance, and superior energy density compared to the previous 18650 batteries. An ideal companion for any 21700 Nitecore flashlights; a great backup battery to have on hand, as more electronic products and Nitecore flashlights will utilize this battery.

Premium Quality Battery

The Nitecore NL2140 comes with all of the safety features, quality engineering, and more that has made Nitecore a trusted brand for rechargeable Li-ion batteries. Your expensive electronics are safely paired with an NL2140 that features a built-in pressure relief valve, high-temperature resistant design, and built-in safeguards to prevent surges. This protects you from overcharging, over-discharging, as well as short-circuits. The NL2140 is built with premium materials, such as nickel-plated stainless steel connectors for impact resistance, good conductivity, and resistance against oxidation. Safe and reliable, the NL2140 is globally insured and has multiple certifications for electronic use.

21700 Battery Buying Guide