We’ve spent hundreds of hours researching and comparing Best 21700 Battery of all specifications to find the best one for any need (or budget). Here are the results.

The Best Best 21700 Battery of 2020 – Top Rated & Reviewed

2,467 Reviews Scanned

Rank No. #1
Fenix are-D1 USB Powered Smart Battery Charger for 21700/18650/16340 with EdisonBright BBX5 Battery Carry case
  • Compatible with Battery Types 26650、21700 18650、16340 14500、10440 AA AAA C
  • Batteries NOT included
  • USB powered battery charger
  • Single charging bay
  • Bundle includes EdisonBright BBX5 battery carry case
Rank No. #2
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
Rank No. #3
NITECORE MPB21 21700i Mini Rechargeable Lantern Flashlight Bundle with 5000mAh Battery Charger and LumenTac Micro USB Cabl
  • MULTIPURPOSE LANTERN - a ML21 magnetic high CRI flashlight lantern with a NL2150HPi 5000mAh battery and a MPB21 magnetic charger.
  • COMPACT AND PORTABLE - snap onto the top of the battery, magnetic high CRI flashlight lantern ML21 provides 80 lumen of light, great for simple activities like camping, reading, or signaling for up to 19 hours
  • A THUMB-SIZE CHARGER - The dual function charger MPB21 snaps onto the top of the battery and provides an easy way to charge your battery, or supply up to 2A current to your phone and other electronic devices.
  • ULTRA-COMPACT 3-in-1 EDC KIT - All items are neatly packed in a small hardshell case, perfect for safe storage and everyday carry, or as an accessory to the Nitecore 21700 flashlights.
  • MPB21 EDC KIT - Included in this bundle is a magnetic snap on ML21 lantern, NL2150HPi 5000mAh rechargeable battery, magnetic snap on MPB21 charger, hardcase and LumenTac micro USB cable.
Rank No. #4
ZRM&E 50pcs 2X Cell 21700 Battery Holder Bracket Cell Safety Shockproof ABS Plastic Brackets 21.2mm Hole Dia for 21700 Lithium Batteries, Black
  • Material: ABS plastic; Suitable for: 21700 lithium battery
  • Aperture: 21.2mm/ 0.83inch
  • Series Mode: 1x2 Cell Spacer
  • Package Content: 50pcs x Battery Holder Brackets.
  • Use: plastic frame holder to fix 21700 battery pack.
Rank No. #5
POWXS Universal Lithium 18650 Battery Charger for 3.7V Li-ion 18650 26650 18490 17670 17500 22650 21700 20700 18350 16340 RCR123A 14500, AA AAA & C Ni-MH Ni-CD Rechargeable Batteries
  • ⚡⚡⚡High Speed Charging: With POWXS advanced charging technology, POWXS 18650 battery charger delivers a blazing fast charge to your batteries, max 950mA each slot output for 3.7V batteries and max 450mA each slot output for 1.2V Ni-MH batteries , provide the fastest possible charge to all Brand C/AAA/AA batteries and 3.7V batteries in 4 hours. Good efficiency to save a lot time for you !
  • ⚡⚡⚡Micro-USB& Type-C Dual Input: universal Micro-USB& Type-C dual input , POWXS Universal 18650 battery charger can adapt for any 5V 2A power bank, computer , car charger, USB Wall Charger etc. POWXS 18650 charger can freely charge batteries any time and anywhere.
  • ⚡⚡⚡Universal Battery Charger: POWXS 18650 battery charger can charge for any 1.2V Ni-MH C AA AAA batteries and 3.7V 18490 18350 17670 17500 16340(RCR123)14500 18650 Li-ion Batteries, easily charge 1 -4pcs of different kinds of batteries at one time , which is your home life good partner and the reliable travel friend.
  • ⚡⚡⚡Multi Protection : POWXS smart battery charger adopted high quality fire-proof material, along with multiple protection technologies, could effectively keep your battery away from over-charging, over-current, over-voltage, over-heated and short circuit, etc. Which eliminate your worries about fire/explosion/battery leakage.
  • ⚡⚡⚡Smart LCD Display: With smart LCD display, POWXS Universal AA AAA battery charger can easily let you know about the charging process. The LCD display could not only flash to show the real-time power capacity when charging, but also identify the bad batteries and give signal, make your charging experience more intelligent.
Rank No. #6
8 Bays 18650 Charger USB C 21700 Battery Charger XTAR VC8 Type C 3A Fast 18650 Charger 8-Bay Smart Charger LCD Display for 3.6V 3.7V Li-ion 10440 16340 18700 26650 1.2V Ni-MH C
  • Type-C port, max 3A for a single slot,VA LCD screen shows batteries’ real-time charging status ( Package not including any batteries )
  • 18650 smart charger, Charge Max 8Pcs 21700 Batteries simultaneously, can charge rechargeable 18650 21700 and 1.2V Ni-MH AA AAA C batteries at the same time. Detect the battery type,select the most suitable charging method
  • How to test the real capacity of the battery ? Answer: In grade mode, the charger tests the real capacity by “charging-discharging-fully charging” the batteries, so that users can know whether the battery capacity is over-stated. In storage mode, the charger can charge or discharge the battery to its rated voltage of the battery to maximize the battery life, when the battery is not used for a long time
  • Q&A:【Q1: Charging currents of vc8? A1: 5 optional currents by manual selection:Max 3A for 1 slot, 2A for 2 slots, 1A for 4 slots, 0.5A for 8 slots. 】 【Q2: What adapter can be used to achieve Max 3A charging? A2: With Max 3A for a single slot(CH1&CH8 only), please have power supply with output “9V 2A” and power cable that supports 3A charging current. 】 【Q3: Can it charge 8 pcs protected 21700 batteries? A3: Yes, it can charge them at the same time or independently】
  • Built-in high-precision MCU, over-current, over-charge, over-voltage, and short-circuit protection, combined with XTAR's soft-start function, makes the precision of end-of-charge voltage up to ±1%
Rank No. #7
NITECORE UI1 Single-Slot Intelligent Lithium-ion Battery USB Charger for 18650, 18350, 20700, 21700, 16340, 14500 and More,and LumenTac Battery Organizer
  • POWERFUL CHARGER-The NITECORE UI1 reaches a single slot maximum charging current of 800mA when using 3.7V rechargeable batteries.
  • MICRO-USB COMPATIBLE - Compatible with multiple USB inputs including solar panels, adapters, and power reservoirs for quick and efficient charging.
  • INTELLIGENT CHARGING - The UI1 is equipped with intelligent charging mode selection that automatically adopts the optimal charging modes for batteries.
  • LIGHTWEIGHT AND COMPACT - Weighing 1.43 ounces and less than 5 inches in length, the lightweight and compact size of the UI1 allows you to carry it with you on the go.
  • UI1 CHARGER KIT - Included in this bundle is the NITECORE UI1 21700/18650 battery charger, usb cable, and LumenTac battery/cable case.
Rank No. #8
NITECORE UMS2 Intelligent USB Dual-Slot Quick Battery Charger for Li-Ion/Ni-MH/Ni-Cd/IMR 16340 14500 18650 21700 20700 AA AAA and More Batteries, with LumenTac Battery Organizer
  • FAST AND EFFICIENT CHARGING- Reach a maximum total of 4000mA for two slots, 3000mA for one slot when pairing with a 9V QC2.0+ output USB power source. Reach a maximum 1000mA charging current per slot when paring with a standard 5V/2A USB source.
  • LCD DISPLAY- Reports key realtime information such as battery health, charging status and charging mode.
  • INTELLIGENT CHARGING- Automatically selects appropriate charging current and voltage to protect the batteries and prolong its lifespan
  • BATTERY TYPES & SIZES - Compatible with various battery types (li-ion/imr/lifep04/ni-cd/ni-mh) and common battery sizes including (18650, 16340,14500, rechargeable AA, AAA).
  • PERFECT FOR TRAVEL AND EDC - This bundle includes a LumenTac battery organizer to keep you organized when you are on the go.
Rank No. #9
Battery Pouch Case for 4 x 18650, 20700 or 21700 Battery, Belt Holster for 18650 Battery with Carabiner, Zipper Pocket Memory Card Storage
  • CAPACITY-Can store battery 18650 x 4. when you carry multiple spare batteries, it will extend the flash light use for several hours.
  • Belt Loop-You can remove it without undoing belt.The touch fastener tape on the back of the pouch for mounting it to your belt. You can also put the pouch into your backpack or shoulder strap for easy carrying. Note:memory card and battery not included.
  • Quickly Take Out or Store the Battery-The pouch features hook & loop closure for quick and easy opening and closing.Ideal to carry on outdoor camping hiking cycling.
  • Extra Zipper Pocket & Carabiner-The zippered pocket can be used to hold small items,such as charging cable,key,headphone,money .etc .When you don’t want to use belt loops, you can use carabiner.For extra safety when used in the field, carabiner can also be used while hanging the battery pouch on the belt.
  • Protective Pouch-Our battery bag is specially designed for people who need to carry 18650 batteries outdoors conveniently. Made of high quality polyester material to protect from dust, moisture, scratches and damage.
Rank No. #10
Eachbid Battery Charging Dual USB Ports Overcharge Protection Universal Battery Charging Dock for Rechargeable Batteries 10440/14500/18650/21700
  • Six protections: overcharge protection, over current protection, over temperature protection, short circuit protection, reverse connection protection, over discharge protection.
  • Suitable for a variety of common rechargeable lithium batteries
  • The light when charging and turn green, automatic stop filling.
  • Compatible battery model: 26700/26650/26500/25500/22700/21700/20700/22650/22500/18700/18650/18500/18490/18350/17650/16650/16340(RCR123)14650/14500
  • Power supply mode: Universal USB micro cable charging

Last update on 2021-11-16 / Affiliate links / Product Titles, Images and Descriptions from Amazon Product Advertising API

Top Rated Best 21700 Battery to Buy Now

 

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How to Choose the Best Best 21700 Battery (with Price and Reviews)

Although most Best 21700 Battery are similar, there are several differences worth noting. Here are nine criteria to consider when choosing an Best 21700 Battery:

(1) Best 21700 Battery Price and Reviews

Although price is not the only factor to consider, it is nevertheless extremely important. The price of an Best 21700 Battery should be in line with its value. You can compare Best 21700 Battery reviews to make sure you are getting a fair price. This is easy to do on Amazon.

(2) Demand

The demand for a particular Best 21700 Battery is a good indication of its ability to perform the functions for which it was designed. If a product has been around for a while and still has a high demand, it is likely a good product.

(3) Material

Best 21700 Battery materials differ from manufacturer to manufacturer. Consider where and how you will be using your Best 21700 Battery to determine if one material would be better than another.

(4) Size

Like most products, Best 21700 Batterys come in various sizes. Do you need a large Best 21700 Batteryor a small one? Think about where you will use your Best 21700 Battery in order to determine the best size. You can also read the customer reviews on Amazon to see what others are saying about the size of the unit they purchased.

(5) Color

Best 21700 Batterys also come in a variety of colors. Do you need a particular color? You should also consider whether the color of your Best 21700 Battery would have any effect on the efficiency of its operation.

(6) Durability

The durability of an Best 21700 Battery will be contingent on the materials used as well as the quality of the manufacturing process. Additionally, the type of Best 21700 Battery you purchase may affect its durability.

(7) Storage

Will you need to store your Best 21700 Battery? If so, you should consider the size and weight of the Best 21700 Batteryto make sure that it can be stored properly. Also, give some consideration to the type of climate in which your Best 21700 Battery will be stored.

(8) Customer Ratings

Customer rating is one of the best criteria for choosing an Best 21700 Battery. It is hard to know exactly how an Best 21700 Battery will perform until you get it home and try it out.

(9) Warranty

Make sure the Best 21700 Battery you are considering is backed by a good manufacturer’s warranty. If it isn’t, you might be better off with another ones.