Top 10 21700 Rechargeable Li-ion Battery – Handheld Flashlights

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1. Keeppower

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Keeppower Type-C USB Rechargeable Li-ion Battery 3.6V 5000mAh Protection Circuit Built in Included with a Charging Cable Great for Tactical Flashlight Power Tools Pack of 2

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Keeppower #ad - Constantly charge and discharge these batteries without noticeable reduction of battery life. Rapid, full charge is achieved in about 3 hours with an additional 2-year standby time. Important: this is a button-top battery built in with added Protection Circuit Board, the whole length of the battery is 76.

4mm longer than a traditional Flat-top Unprotected battery. Built-in type-C port in battery, anywhere. High performance & long runtime: 5000mah capacity and 18Wh energy make this battery much stronger to power your flashlights and to keep them running in a long time before a new recharge is needed. Long battery life: these 3. 6v/5000mah batteries come without the typical lead Acid memory effects. Please make sure it fits your flashlight before purchase! Usb charge: easy to charge with the included a type-c usb cable; no additional charger or adapter required.

The led indicator light shows the charging progress clearly: RED = still charging, just plug into any Type-c USB port anytime, BLUE = finished charging. Safety & warranty: built-in integrated safety circuit protects battery from over discharge/overcharge; the Keeppower USB rechargeable batteries are RoHS, PSE and CE listed, and have a 30-day money back guarantee as well as a 12-month quality guarantee and lifetime technical support. Ultra-low self-discharge, durable in use and storage.
BrandKeeppower #ad
ManufacturerKeeppower #ad
Weight0.17 Pounds

2. Nitecore

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NITECORE E4K Next generation 21700 Compact EDC Flashlight, 4x CREE XP-L2 V6-4400 Lumens, 1x NITECORE 21700 Rechargeable Li-ion Battery Included

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Nitecore #ad - The included two-way clip also enables additional carrying ways to be clipped in the pocket, 3 special modes and dual user modes available to offer direct access to TURBO/STROBE, the backpack or the belt. It provides 700 hours ultra long runtime for a consistent usage of 30 days on ULTRALOW. The integrated atr technology regulates the output of the E4K according to the working condition and ambient environment to maintain the optimal performance.

Specially designed for outdoor applications, the one hand operable side switch of the e4k has a wearproof silicone cover which is friendly for glove users. Included accessories: 1 x nitecore 21700 rechargeable li-ion battery nl2150HPR 5, Clip, 000mAh, USB-C charging cable, Spare O-ring, Holster, Lanyard, CR123 Battery Magazine. With the nl2150hpr battery 5, 000mah included, the e4k is recommended to be powered by 1 x 21700 battery discharge current over 15a while compatible with 2 x CR123 / RCR123 batteries.

Equipped with 4 x cree xp-l2 v6 leds with a lifespan of 50, trekking, the nitecore e4k is able to emit a blazing output of 4, 100cd and a max throw of 211 meters, 000 hours, ideal for EDC Everyday Carry, 400 lumens from a palm sized body with a max peak beam intensity of 11, camping and more. The independently controlled quadruple LEDs are powered by a constant current circuit to provide a durable usage with guaranteed safety. With 5 brightness levels, it serves as your best lighting tool for multiple scenarios.
BrandNitecore #ad
ManufacturerNiteCore #ad
Part Numbernitecore-e4k
Modelnitecore-e4k

3. Nitecore

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NITECORE i4000R Future Oriented 21700 Intelligent Rechargeable Tactical Flashlight, 4 x CREE XP-L2 V6-4400 Lumens, 1 x Nitecore 21700 Rechargeable Li-ion Battery Included

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Nitecore #ad - Distinguished by its convenient reversible design with a USB-C charging cable. The randomly changing frequencies combined with the 2nd Generation STROBE READY Technology can cause stronger dizzying effects due to the inadaptability of the naked eyes. Included accessories: 1x nitecore 21700 rechargeable li-ion battery nl2150hpi 5, Spare O-ring, lanyard, Clip, CR123 Battery Magazine, USB-C charging Cable, 000mAh, Tactical Holster NTH20.

The independently controlled quadruple LEDs are powered by a constant current circuit to provide a durable usage with guaranteed safety. The integrated atr technology regulates the output of the i4000R according to the working condition and ambient environment to maintain the optimal performance. The ultimate dual tail switch design is able to access 5 brightness levels and strobe mode for different environments. The nitecore ntr10 is also available as a tactical accessory to enable a unique and flexible way of carrying or operating a flashlight. The standard tube diameter of 1 makes the i4000r compatible with nitecore gun mounts including gm02 40-40, gm03 and gm04.

The included 21700 i series battery provides an upgraded performance of the flashlight with a 380-hour extended runtime to guarantee an extensive usage in your mission while compatible with 2 x CR123 / RCR123 batteries. Utilizing 4 x cree xp-l2 v6 leds with a lifespan of 50, ideal for law enforcement, 300cd as a tactical blazing performance, a max throw of 230 meters and a max peak beam intensity of 13, the i4000R has a max output of 4, 400 lumens, assault operations, 000 hours, self defense, search and patrols. The momentary access to turbo of 4, 400 lumens enables an abrupt disturbance to your adversary during the day or at night.
BrandNitecore #ad
ManufacturerNiteCore #ad
Part Numbernitecore-i4000r
Modelnitecore-i4000r

4. Fenix Flashlights

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Fenix E35 V3.0 3000 Lumen LED Flashlight, 2 X 5000mAh USB-C Rechargeable batteries with EdisonBright battery carrying case bundle

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Fenix Flashlights #ad - Includes a 21700 rechargeable Li-ion battery, with 5000 mAh large capacity. Utilizes luminus sst70 cool white LED, with alifespan of 50, 000 hours. Reverse polarity protection, to protect from improper battery insertion. Bundle includes additional ARB-L21-5000U battery and EdisonBright Battery carrying case. 3000 lumens maximum output, 240 meters maximum beam distance.
BrandFenix Flashlights #ad
ManufacturerEdisonBright #ad
Part NumberFEN-E35V3-L2150U-BBX5

5. OLIGHT

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Olight 217C50 5000mAH Customized Rechargeable Battery for Olight Seeker 2, Warrior X Pro, with Battery Organizer, and Odin Flashlights, Freyr, M2R Pro, Seeker 2 Pro

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OLIGHT #ad - Safety features: - built-in protection board to protect against over-discharge, overcharge and short circuit. Customized designed - the olight 217c50 is designed only for olight seeker 2 3000 lumens, Seeker 2 Pro 3200 lumens, Warrior X Pro 2250 lumens and M2R Pro 1800 lumens flashlights see Compatibility list below for more details. High performance - the olight 217c50 is a 5000mAH high performance, high drain rechargeable battery.
BrandOLIGHT #ad
ManufacturerOLIGHT #ad
Height0.85 Inches
Length2.96 Inches
Weight0.25 Pounds
Width0.85 Inches

6. Nitecore

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2 x Nitecore 21700 Rechargeable Li-ion Batteries Included, Combo: NITECORE i4000R Future Oriented 21700 Intelligent Rechargeable Tactical Flashlight, 4 x CREE XP-L2 V6-4400 Lumens

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Nitecore #ad - Utilizing 4 x cree xp-l2 v6 leds with a lifespan of 50, 300cd as a tactical blazing performance, self defense, assault operations, 400 lumens, the i4000r has a max output of 4, a max throw of 230 meters and a max peak beam intensity of 13, 000 hours, ideal for law enforcement, search and patrols. The standard tube diameter of 1 makes the i4000r compatible with nitecore gun mounts including gm02 40-40, gm02 40-75, gm03 and gm04.

Specially designed for law enforcement, the compact and MOLLE System compatible NTH20 Tactical Holster is included to enable a quick release of the flashlight with an adjustable stopper on the clip to suit belts of various sizes. Distinguished by its convenient reversible design with a USB-C charging cable. The integrated atr technology regulates the output of the i4000R according to the working condition and ambient environment to maintain the optimal performance. The included 21700 i series battery provides an upgraded performance of the flashlight with a 380-hour extended runtime to guarantee an extensive usage in your mission while compatible with 2 x CR123 / RCR123 batteries.

The ultimate dual tail switch design is able to access 5 brightness levels and strobe mode for different environments. The momentary access to turbo of 4, 400 lumens enables an abrupt disturbance to your adversary during the day or at night. The randomly changing frequencies combined with the 2nd Generation STROBE READY Technology can cause stronger dizzying effects due to the inadaptability of the naked eyes. The nitecore ntr10 is also available as a tactical accessory to enable a unique and flexible way of carrying or operating a flashlight.
BrandNitecore #ad
ManufacturerNiteCore #ad
Part Numberi4000r-2x-hpi
Modeli4000r-2x-hpi

7. MAXIAEON

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Water Resistant, Super Bright 2000 Lumen 18650 Tactical Flashlight and 6PCS 3.7V 9900mAh Rechargeable Battery+Batteries Charger,Zoomable, 5 Modes Handheld Flashlight

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MAXIAEON #ad - Please rest assured to buy, no worries at all. Two flat head plugs or USB plugs are shipped randomly. Tough & reliable: ip65-rated water resistant and designed for use in heavy rain.

High-capacity performance lasting:this rechargeable High Capacity battery that can last up to 3~6 hours with a single charge. The battery is perfectly protected against heat and high temperature, allowing you to charge safely. Long-lasting: up to 6 hours medium-beam mode of powerful, non-diminishing brightness from the included premium rechargeable High Capacity battery. 12 months warranty and 30 days money back guarantee. Super-bright: 2000 lumen max led flashlight, medium, ultra wide beam effortlessly illuminates a whole room or backyard. Adjustable focus with 5 modes: High, Strobe, Low, and SOS/Emergency protect your safety. Its durable aluminum body and shock-resistance endure rough handling.
BrandMAXIAEON #ad
Manufacturerning bo tan mei zhao ming ke ji you xian gong si #ad
Part Number5954
ModelXML-T6

8. Nitecore

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Combo: NITECORE i4000R Future Oriented 21700 Intelligent Rechargeable Tactical Flashlight, 3 x Nitecore 21700 Rechargeable Li-ion Batteries Included, 4 x CREE XP-L2 V6-4400 Lumens

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Nitecore #ad - The integrated atr technology regulates the output of the i4000R according to the working condition and ambient environment to maintain the optimal performance. Specially designed for law enforcement, gm02 40-75, the compact and MOLLE System compatible NTH20 Tactical Holster is included to enable a quick release of the flashlight with an adjustable stopper on the clip to suit belts of various sizes.

The nitecore ntr10 is also available as a tactical accessory to enable a unique and flexible way of carrying or operating a flashlight. The ultimate dual tail switch design is able to access 5 brightness levels and strobe mode for different environments. The standard tube diameter of 1 makes the i4000r compatible with nitecore gun mounts including gm02 40-40, gm03 and gm04. Utilizing 4 x cree xp-l2 v6 leds with a lifespan of 50, 000 hours, 300cd as a tactical blazing performance, ideal for law enforcement, self defense, 400 lumens, a max throw of 230 meters and a max peak beam intensity of 13, the i4000r has a max output of 4, assault operations, search and patrols.

Included accessories: 3x nitecore 21700 rechargeable li-ion battery nl2150hpi 5, CR123 Battery Magazine, Lanyard, Clip, Spare O-ring, 000mAh, usB-C charging Cable, Tactical Holster NTH20. The momentary access to turbo of 4, 400 lumens enables an abrupt disturbance to your adversary during the day or at night. The included 21700 i series battery provides an upgraded performance of the flashlight with a 380-hour extended runtime to guarantee an extensive usage in your mission while compatible with 2 x CR123 / RCR123 batteries. The independently controlled quadruple LEDs are powered by a constant current circuit to provide a durable usage with guaranteed safety.
BrandNitecore #ad
ManufacturerNiteCore #ad
Part Numberi4000r-3x-hpi
Modeli4000r-3x-hpi

9. IMALENT

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Powered by Rechargeable 21700 Li-ion Batteries, with 6 Pcs CREE XHP70 2nd LEDs, IMALENT MS06 LED Flashlight 25000 Lumens, High Lumen Tactical Handlight Super Bright Torch

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IMALENT #ad - 5 modes for flashlight and convenient power: 5 basic brightness modes: 9000lm/4000lm/2500Lm/1200Lm/200Lm. Different modes of this led flashlight fit for different everyday or emergency occasions. 2 emergency modes: strobe/25000Lm, Strobe/25000Lm. You do not need to cycling through flashing modes to adjust the brightness.

The flashlight will remember the last used mode. Also, provides max 31h runtime on low mode. Functional: features five lighting modes with mode memory plus strobe, turbo, all of which can be pressed the switch button to turn on/off. The anti-slip exclusive knurling holds fast in your hand during extreme conditions. Net weight´╝Ü572gbattery included. Next time you turn on the flashlight, it will light up at the exact mode you choose. The newest design with magnetic charging indicators on the side only light when using 3 x 21700 4000mAh Li-ion Batteries.

Don't worry about accidentally dropped Impact Resistance up to 1. 5 meters. Super-bright: with 6 pcs cree xhp70 2nd leds50000-hour lifespan, imalent ms06 could out up to 25000-lumens brightness on high mode which only runs with 3 x 21700 4000mAh Li-ion Batteries. Product size:56head diameter*51body diameter*119lengthmm. Compact: aerospace-grade aluminum alloy body, wear-resistant Type III hard-anodized surface treatment.
BrandIMALENT #ad
ManufacturerIMALENT #ad
Part NumberMS06

10. Skywolfeye

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5 Light Modes Waterproof for Camping Hiking etc., Skywolfeye 8 Pack 3.7v 5000mAh Rechargeable 18650 Battery Li-ion Button Top and 4 Slot Charger with 1Pcs 4000 Lumen 18650 Flashlight Zoomable

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Skywolfeye #ad - Package included: 1 x 4 bay universal Battery Charger, 8 x 3. 7v rechargeable Batteries, 1x Flashlight. 18650 lithium 3. 7v rechargeable batteries can be used to power everyday appliances with the capacity 3.

7v. Battery charger with red/green led light display, safe and fire prevention PC+ABS material Battery Charger, with heat-resisting, low temperature resistance and scratch resistance. Skid-proof design & waterproof design LED bulbsNot for Diving, climbing, producing super bright light Perfect for cycling, Size:7.66inchx1. 37inch, led lifespan: 100, 000 hours, camping and outdoor activity etc. Flashlight power supply: 2 x 18650 rechargeable battery at a timeincluded, it is 8. 46inch extend the head. Pair it up with your flashlight, Controller, Headlamp, Home Security Devices, Electronic Toy, and other Household Appliances.
BrandSkywolfeye #ad
ManufacturerSkywolfeye #ad
Height8.46 Inches
Length7.6 Inches
Width1.37 Inches
Part NumberT66
ModelT66