Will this battery work in my flashlight if it takes 21700 cells?

Yes, this cell fits any device designed for 21700 batteries. It has the same physical dimensions as standard 21700 cells and works in flashlights, headlamps, and other compatible gear.

How do I recharge this battery?

Use any lithium-ion charger designed for 21700 cells. The battery does not include a charger, but it works with standard chargers you may already own.

What does low-temperature performance actually mean?

This cell maintains more than double the discharge efficiency of a standard 21700 battery at -40°F. That means your flashlight stays brighter and runs longer in freezing temperatures where ordinary batteries lose most of their capacity.

Is a used battery safe to use?

This cell has been tested and verified for function. It includes built-in protection against overcharge, over-discharge, and short circuits. Like any used battery, its total lifespan depends on how many charge cycles it has already completed, which you cannot verify independently.

Can I use this in warm weather too?

Yes, this battery works in normal temperatures as well. The low-temperature chemistry does not limit its performance in warmer conditions—it simply maintains capacity in cold weather where standard cells would fail.

Nitecore NL2142LTP Cold Weather Low Temperature 21700 Battery - Used

stainless steel
rechargeable

The 3-second version

Maintains discharge efficiency at -40°F where standard cells fail
4200mAh capacity supports extended runtime in cold conditions
Delivers over 8 amps continuous for high-output flashlights
Used cell with unknown cycle count
Requires a separate lithium-ion charger
Only fits 21700-compatible devices

Why it's on GiftsFeed

Rechargeable 21700 battery engineered to hold charge in sub-zero conditions

Standard lithium-ion cells lose half or more of their capacity once the temperature drops below freezing, which is why your headlamp dims on winter mornings and your backup light dies halfway through a cold night. This cell uses specialized low-temperature chemistry that maintains output where ordinary batteries quit, so you get consistent brightness and runtime even at -40°F.

The difference matters if you rely on battery-powered lights in genuinely cold conditions—overnight winter trips, early-season hunts, or work shifts that start before sunrise in January. Most people can get by with standard cells and hand warmers; this one is for situations where a dimming light or a dead battery creates real problems, not just inconvenience.

Good gift when

Winter hikers and campers who need reliable light in freezing temperatures
People working outdoors in cold climates with battery-powered tools
Emergency preparedness kits in regions with harsh winters
High-output flashlight users who run gear in sub-zero conditions

Skip it if This is a used battery that has seen prior service, so you won't know its exact charge cycle history or remaining lifespan when it arrives.

Specs

Battery size: 21700
Capacity: 4200mAh
Discharge current: >8A continuous
Chemistry: Lithium-ion with low-temperature formulation
Protection features: PTC surge protection, pressure relief valve, overcharge/over-discharge protection
Terminal material: Nickel-plated stainless steel
Condition: Used, tested and verified

What's included

Nitecore NL2142LTP 21700 battery (used, tested)

If you're giving it

No sizing to guess

Used battery arrives without retail packaging; buyer should confirm device compatibility.

The details

Most lithium-ion batteries lose capacity quickly when the temperature drops, leaving flashlights dim and devices dead just when you need them. This 21700 cell uses low-temperature chemistry that maintains more than double the discharge efficiency of standard cells at -40°F, so your gear keeps working through winter expeditions, overnight hikes, and extended cold-weather work.

The 4200mAh capacity supports extended runtimes even in freezing conditions, and the cell delivers continuous discharge currents above 8 amps to drive high-output flashlights and headlamps at full brightness. Nickel-plated stainless steel terminals resist corrosion and maintain conductivity in harsh environments, while a built-in pressure relief valve and PTC protection guard against overcharge, over-discharge, and short circuits.

This is a used cell that has been tested and verified for function. It fits any device designed for 21700 batteries and recharges in standard lithium-ion chargers. The protection circuitry monitors cell health during every charge and discharge cycle, and the impact-resistant construction handles the knocks that come with field use. If you run lights or tools in temperatures where ordinary batteries quit, this cell keeps delivering power when everything else fades.

Nitecore

Nitecore NL2142LTP Cold Weather Low Temperature 21700 Battery - Used

High-capacity lithium-ion cell doubles typical discharge efficiency at -40°F

$20.76$25.9520% offat nitecorestore.com

Quantity

Ships and sold by Nitecore. About this merchant

The 3-second version

Maintains discharge efficiency at -40°F where standard cells fail
4200mAh capacity supports extended runtime in cold conditions
Delivers over 8 amps continuous for high-output flashlights
Used cell with unknown cycle count
Requires a separate lithium-ion charger
Only fits 21700-compatible devices

Questions

Will this battery work in my flashlight if it takes 21700 cells?: Yes, this cell fits any device designed for 21700 batteries. It has the same physical dimensions as standard 21700 cells and works in flashlights, headlamps, and other compatible gear.
How do I recharge this battery?: Use any lithium-ion charger designed for 21700 cells. The battery does not include a charger, but it works with standard chargers you may already own.
What does low-temperature performance actually mean?: This cell maintains more than double the discharge efficiency of a standard 21700 battery at -40°F. That means your flashlight stays brighter and runs longer in freezing temperatures where ordinary batteries lose most of their capacity.
Is a used battery safe to use?: This cell has been tested and verified for function. It includes built-in protection against overcharge, over-discharge, and short circuits. Like any used battery, its total lifespan depends on how many charge cycles it has already completed, which you cannot verify independently.
Can I use this in warm weather too?: Yes, this battery works in normal temperatures as well. The low-temperature chemistry does not limit its performance in warmer conditions—it simply maintains capacity in cold weather where standard cells would fail.