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Nitecore NL2140 4000mAh Rechargeable 21700 Battery - USED
NITECORE NL2140 21700 4000mAh Rechargeable Li-ion Battery Used

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Used Price: $12.70

Quantity in Stock:(Out of Stock)

Availability: Usually Ships in 24 Hours
Product Code: BAT-NITE-21700-NL2140-USED


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.

NITECORE NL2140 At-A-Glance

  • A built-in pressure relief valve
  • A microporous barrier for heat dissipation
  • Built-in PTC for surge protection
  • Nickel-plated stainless steel cathode and anode
  • Abrasion-resistant coating
  • Overcharge, over-discharge protection

Included in the Box

  • NITECORE NL2140 21700 Battery

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

It is not compatible with E4K, HC35, i4000r, i Series . Learn more at 21700 Battery Guide: What You Need to Know


Capacity 4000mAh
Voltage 3.6V
Discharge Current 5A
Weight 2.57oz (73g)
Length 2.98in (75.8mm)
Diameter 0.86in (21.8mm)

Compatible Chargers

21700 Battery Compatibility

  • This is a button top battery designed for flashlights that accept standard 21700 batteries.
  • It does NOT work in any non-flashlight device.
  • It does NOT work in any flashlights that require a custom battery.
  • It is not compatible with E4K, HC35, i4000r, P10i, P10iX, P20i, P20i UV, P20iX.
  • It does NOT work in any electronics that only accept flat top batteries.
  • It can be charged in a lithium-ion charger such as UI1, UI2, UMS2, UMS4.

Nitecore UMS2 Dual-Slot USB Fast Charger, for 18650, 21700 batteries
Price: $28.95

NITECORE UMS2 Intelligent USB Dual-Slot Superb Battery Charger
Nitecore UI2 Dual-Slot USB Charger, for 18650, 21700, 18350, 20700 Batteries
Price: $12.99

NITECORE UI2 Dual-Slot Intelligent Portable USB Li-ion Battery Charger for 18650, 18350, 20700, 21700 Batteries
Nitecore UMS4 USB Four-Slot USB Fast Charger, for 18650, 21700 Batteries
Price: $38.95

NITECORE UMS4 Intelligent USB Four-Slot Superb Battery Charger
Nitecore UI1 USB Charger, for 18650, 21700, 18350, 20700 etc Batteries
Price: $7.99

NITECORE UI1 Single-Slot Intelligent Portable USB Li-ion Battery Charger for 18650, 18350, 20700, 21700 Batteries

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