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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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Table of Contents

1 What is the best 21700 battery to buy?
2 Best 21700 Battery Reviews
3 Offers and Discounts
4 Cheap 21700 Battery
5 Buy 21700 Battery Online
6 Best 21700 Battery 2022

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What is the best 21700 battery to buy?

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Best 21700 Battery Reviews

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Offers and Discounts

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Best S4 Battery

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

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.
SAFETY FEATURES: - Built-in protection board to protect against over-discharge, overcharge and short circuit

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)

【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). 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. Built-in Type-C port in battery, just plug into any Type-c USB port anytime, anywhere. The LED indicator light shows the charging progress clearly: RED = still charging, BLUE = finished charging.
【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. 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. Ultra-low self-discharge, durable in use and storage.
【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.

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Nitecore HC35 Rechargeable LED Headlamp - 2700 Lumen - 2x 21700 battery & Eco-Sensa USB Charging Cable

As a powerful upgraded L-shaped headlamp, the HC35 is equipped with 4 x CREEXP-G3 S3 LEDs with a lifespan of 50,000 hours, the HC35 has an ultra high performance of a max peak beam intensity of 4,500cd and a max throw of 134meters.
Specially designed for outdoor applications, the 100 wide range flood optic system ideally covers the field of view of human eyes. The bead surfacetotal reflective optic lens is precisely calculated to form a soft and comfortable beam.
A single switch controls 5 brightness levels and 3 special modes.
Includes an extra 4000mAh 21700 battery and Eco-Sensa Micro USB charging Cable
ships out within one business day

OLIGHT Seeker 2 Pro 3200 Lumens Side Switch Rechargeable Tactical Flashlight with 2 x 21700 Battery and Patch

Compact size with powerful performance: incredibly delivers a maxmum output of 3,200 lumens and a long beam distance of 250 meters, providing you a new flagship-level illumination experience.
Convenient L-dock included: can be attached to or fixed on a wall or table indoors that is close to a power source, providing a dedicated charging location for your Seeker 2 pro.
Visual display indicators on both sides of the switch: the four indicators on the right side clearly display the battery level and the four on the left side display the brightness level.
Milled finger grooves and dermatoglyphic silicone are used on the surface of the holding position, making it soft and anti-slip.
Customized high capacity 21700 lithium rechargeable battery: currently the highest 5000mAh battery in its size for great runtimes.

Fenix PD40R v2 3000 Lumen Mechanical Switch Operated USB-C Rechargeable LED Flashlight, include 2x 5000mAh Battery and LumenTac Battery Case

SUPER BRIGHT FLASHLIGHT - PD40R v2 is capable of a super bright 3000 lumen maximum output that reaches 442 yards in distance, an ideal duty light for professionals like law enforcement, inspection, and security.
RECHARGEABLE WITH HIGH CAPACITY BATTERY - The PD40R v2 has a fast charging USB-C port to fully charge the included 5000mAh 21700 battery within 3.5 hours, ready to go the extra mile whenever you need it.
PRECISE CONTROL - a mechanical switch that smoothly rotates/transits among the four brightness modes and strobe to get the function you need.
LIGHTWEIGHT AND COMPACT - fits right in the palm of your hand while easy to carry around. A great companion for outdoor excursions such as camping and hiking. Take it with you everywhere!
PD40R v2 BACKUP BATTERY KIT - Included in this bundle is a Fenix PD40R v2 flashlight, 2x ARB-L21-5000 5000mAh 21700 rechargeable battery, USB-C charging cable, holster, lanyard, and LumenTac battery case.

Fenix are-A2 Smart Battery Charger for 21700/18650/16340 with EdisonBright BBX5 Battery Carry case

Charge 1 or 2 batteries at the same time
Compatible Batteries 10440 14500 16340 18650 21700 26650 Ni-MH / NiCd: AA, AAA and C
Multiple levels of protection Short-Circuit Protection Over-Current protection, Over-Voltage protection, Reverse Polarity protection,
LCD screen display
Bundle includes EdisonBright BBX5 battery carry case

Fenix PD36R 1600 Lumen Type-C USB Rechargeable EDC Tactical Flashlight with 2X Fenix Batteries and LumenTac Battery Organizer

POWERFUL TACTICAL LIGHT - The Fenix PD36R is the ultimate tactical flashlight with a brighter beam up to 1600 lumens, farther throw up to 309 yards, and longer run time in a compact everyday carry (EDC) ready package you've come to expect from the Fenix PD series.
USB TYPE-C FAST CHARGING - The 5000mAh high-capacity battery included with the PD36R is twice as powerful as common batteries giving you over 115 hours of runtime. The included type-C USB charging cable charges at double the speed of a standard micro -USB.
EASY TO USE - The dual switch design is easy to use and tactile so you can even operate the PD36R while wearing gloves. Enjoy instant access to turbo mode, strobe function, and previously used setting with intelligent mode memory.
DESIGNED FOR EVERYDAY CARRY - Take the PD36R anywhere with the two-way body clip that can be attached to backpacks, belts, and molle systems for easy access, or use the included holster or lanyard designed for EDC.
BACK-UP BATTERY INCLUDED - This package includes 2x Fenix rechargeable batteries and a LumenTac battery organizer so your Fenix PD36R will be ready whenever you need it.

Olight Seeker 2 Pro 3200 Lumens L-Dock Charging Powerful Rechargeable Side-switch Tactical Flashlight,with 21700 Battery and SKYBEN Battery Case

Convenient L-dock included: can be attached to or fixed (3M tape included) on a wall or table indoors that is close to a power source, providing a dedicated charging location for your Seeker 2 pro.
The Seeker 2 pro includes a 3.9 ft long 1A magnetic USB cable (The MCC1AL is compatible with OLIGHT S, M, and H series).
Compact size with powerful performance: incredibly delivers a maxmum output of 3,200 lumens and a long beam distance of 250 meters, providing you a new flagship-level illumination experience.
Visual display indicators on both sides of the switch: the four indicators on the right side clearly display the battery level and the four on the left side display the brightness level.
Customized high capacity 21700 rechargeable battery: currently the highest 5000mAh battery in its size for great runtimes.

Fenix PD36R 1600 Lumen Type-C USB rechargeable LED tactical Flashlight, 2 X batteries with EdisonBright charging cable carry case bundle

1600 maximum lumens output and 283 meters beam distance.
Powered by a High Capacity 21700 Rechargeable Li-ion Battery ( 2 X included)
4-hour fast charging with 5V/3A USB Type-C charging port.
Instant power activation with momentary tactical tail switch.
Bundle includes additional battery and EdisonBright charging cable carrying case

Klarus G15 4000 Lumens Ultra-Bright Compact Rechargeable EDC Flashlight, CREE XHP70.2 LED, 5000mAh 21700 Battery Powered Long Runtime Side Switch LED Flashlight

【High Lumens Flashlight】This flashlight utilizes a CREE XHP70.2 LED, max output 4000 lumens, max beam distance 616feet(188 meters).
【Compact Size with Lightweight】4.75in body length, even 15% smaller than ordinary 18650 flashlights, G15 can easily pack hidden in your pocket. 5-ounce weight body(Include battery), carry without feeling.
【8 Lighting Modes】5 brightness levels: Turbo/High/Mid/Low/Moonlight. 3 emergency modes: Strobe/ Beacon/ SOS.
【Easy and Convenient Operation】 One click on/off, hold to switch between Low/ Mid/ High. Double click to activate turbo, and triple-click to access the Strobe/ Beacon/SOS mode. When the light is off, press and hold the side switch to access the moonlight mode. Side switch could be lockout preventing accidental activation in your pocket or packs.
【Large Capacity Battery and 2A Fast Recharging】The flashlight is powered by a 5000mAh 21700 Li-ion battery, can support a maximum of 200 hours or 40 days(5 hours/day) runtime. With 2A high current USB charging port, fast and convenient.

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Last update 2020-09-20. Price and product availability may change.