Do I need a specific charger for this battery?

You need a lithium-ion charger designed for 21700 cells. Standard alkaline or NiMH chargers will not work and could damage the battery or create a safety hazard.

How do I know if my device accepts a button-top battery?

Check your device's battery compartment or manual. If it specifies flat-top only, this button-top cell may not fit or make proper contact. Many flashlights and vaporizers accept both styles.

Can I use this in cold weather or outdoor conditions?

The IPX6 rating protects against water jets and splashes, making it suitable for rain or dusty environments. Lithium-ion cells perform well in moderate cold but lose some capacity in freezing temperatures.

How long does a full charge take?

Charge time depends on your charger's output current. A 1A charger takes roughly five to six hours, while a 2A or faster charger cuts that time in half. Always use a charger rated for lithium-ion cells.

What happens when the battery reaches 500 cycles?

After 500 full discharge-and-recharge cycles, the cell retains most of its original capacity but begins to lose storage gradually. It remains safe to use; runtime just decreases over time.

Nitecore NL2155HP 5500mAh Rechargeable 21700 Battery

stainless steel
waterproof
rechargeable

The 3-second version

5500mAh capacity with continuous 20A discharge for high-drain gear
IPX6 waterproof rating protects against jets and submersion
Protective circuit prevents overcharge, over-discharge, and shorts
Button-top design may not fit flat-top compartments
Requires a compatible lithium-ion charger
Not compatible with devices specifying lower voltage

Why it's on GiftsFeed

High-capacity 21700 rechargeable battery with 20A continuous discharge

Most rechargeable 21700 cells force you to choose between capacity and output: high-mAh versions throttle under load, while high-amp cells run out fast. This one delivers both 5500mAh storage and 20A continuous discharge, so your flashlight stays bright through a full shift or your vaporizer heats without stutter. The IPX6 rating matters because most lithium cells fail when water breaches the seal—this one shrugs off rain and mud without corroding the terminals or shorting the circuit. If you run through cells weekly or your gear demands more than budget batteries can sustain, the 500-cycle lifespan turns a higher up-front cost into the cheapest option per use.

Good gift when

People using high-output flashlights or multi-LED torches regularly
Users who need reliable backup power in wet or dusty conditions
Anyone replacing 21700 cells frequently and tired of disposal costs
Owners of devices that drain alkaline batteries in under an hour

Skip it if Your device requires a flat-top 21700, since this cell has a button-top positive terminal that may not fit all battery compartments

Specs

Capacity: 5500mAh
Continuous Discharge Current: 20A
Battery Size: 21700
Water Resistance: IPX6
Cycle Life: Over 500 full recharge cycles
Protection Features: Intelligent circuit, pressure relief valve
Terminal Material: Nickel-plated stainless steel

What's included

Nitecore NL2155HP 21700 battery

If you're giving it

No sizing to guess

Pairs well with a compatible charger if the recipient doesn't already own one.

The details

This 21700 lithium-ion cell packs 5500mAh into a format that fits devices demanding sustained high-current output. The 20-amp continuous discharge rating handles power-hungry flashlights, vaporizers, and tools without voltage sag or thermal throttling. Built-in protection circuitry monitors charge state and cuts power if voltage goes too high, too low, or if a short develops, so the cell shuts down before damage occurs.

Nickel-plated stainless steel caps on both ends absorb impact if you drop the battery and resist the corrosion that builds up on unprotected terminals. A metallic coating over the body resists scratches and abrasion from repeated insertion and removal. The pressure relief valve vents gas if internal pressure climbs, preventing rupture in the unlikely event of a fault.

IPX6 certification means the battery survives direct water jets from any angle, so rain, splashes, or dusty environments won't compromise the seal. After 500 complete discharge-and-recharge cycles, the cell retains most of its original capacity, extending the effective lifespan well beyond throwaway alkaline options. Compatible with any 21700-sized device and any lithium-ion charger designed for this format.

Nitecore

Nitecore NL2155HP 5500mAh Rechargeable 21700 Battery

IPX6-rated lithium-ion cell built to survive drops, water exposure, and 500+ charge cycles

$24.95at nitecorestore.com

Quantity

Buy from Nitecore

Ships and sold by Nitecore. About this merchant

The 3-second version

5500mAh capacity with continuous 20A discharge for high-drain gear
IPX6 waterproof rating protects against jets and submersion
Protective circuit prevents overcharge, over-discharge, and shorts
Button-top design may not fit flat-top compartments
Requires a compatible lithium-ion charger
Not compatible with devices specifying lower voltage

Cheaper alternatives

Nitecore NL2150DW 5000mAh Customized Rechargeable Battery for the R40 v2 - Used$15.96

Questions

Do I need a specific charger for this battery?: You need a lithium-ion charger designed for 21700 cells. Standard alkaline or NiMH chargers will not work and could damage the battery or create a safety hazard.
How do I know if my device accepts a button-top battery?: Check your device's battery compartment or manual. If it specifies flat-top only, this button-top cell may not fit or make proper contact. Many flashlights and vaporizers accept both styles.
Can I use this in cold weather or outdoor conditions?: The IPX6 rating protects against water jets and splashes, making it suitable for rain or dusty environments. Lithium-ion cells perform well in moderate cold but lose some capacity in freezing temperatures.
How long does a full charge take?: Charge time depends on your charger's output current. A 1A charger takes roughly five to six hours, while a 2A or faster charger cuts that time in half. Always use a charger rated for lithium-ion cells.
What happens when the battery reaches 500 cycles?: After 500 full discharge-and-recharge cycles, the cell retains most of its original capacity but begins to lose storage gradually. It remains safe to use; runtime just decreases over time.