Best 21700 Batteries In September 2026

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In this article, we will present the top 10 Best 21700 Batteries available on the market, along with our expert reviews. Get one of them and have fun! You’ll love it!

To help you in your search, we have completed this list of the Best 21700 Batteries.

Top Rated Best 21700 Batteries Of 2026

Rank	Product Name	Score
1	AmazonBasics AA High-Capacity Ni-MH Rechargeable Batteries (2400 mAh), Pre-charged - Pack of 4 Buy Now	9.7 Buy Now
2	Smart Rechargeable Battery Charger for Ni-MH Ni-Cd A AA AAA C SC F6 Buy Now	9.5 Buy Now
3	Fenix are-D1 USB Powered Smart Battery Charger for 21700/18650/16340 with EdisonBright BBX5 Battery Buy Now	9.1 Buy Now
4	DOTTMON LCD Smart Universal Battery Charger 4 Bay for Rechargeable Batteries AA AAA Buy Now	8.8 Buy Now
5	Fenix are-A2 Smart Battery Charger for 21700/18650/16340 with EdisonBright BBX5 Battery Carry case Buy Now	8.6 Buy Now
6	M&A BD 2 Pack of 40T-Purple, 4000mAh, 30A, Rechargeable, Replacement for 21700-Battery, Buy Now	8.3 Buy Now
7	M&A BD 2 Pack of 50E-Green, 5000mAh, Rechargeable, Replacement for 21700-Battery, for LED Buy Now	8.1 Buy Now
8	M&A BD 2 Pack of 4200mAh, Gray-P42A, 45A, Replacement for 21700-Battery, Rechargeable, Buy Now	7.8 Buy Now
9	Miboxer C4 V3 Universal 18650 Charger 4 Slots for Rechargeable Batteries Ni-MH Ni-Cd Buy Now	7.5 Buy Now
10	NITECORE UMS2 Intelligent USB Dual-Slot Quick Battery Charger for Li-Ion/Ni-MH/Ni-Cd/IMR 16340 14500 18650 Buy Now	7.2 Buy Now

1. AmazonBasics AA High-Capacity Ni-MH Rechargeable Batteries (2400 mAh), Pre-charged - Pack of 4

• The batteries can be recycled when they no longer hold a charge, to find a recycling location near you, simply copy/paste this link into your browser: call2recycle.org/locator/
• Ships in certified frustration-free packaging, recyclable, backed by an amazonbasics 1-year limited warranty
• One 4-pack of aa high-capacity rechargeable batteries (2400mah) ideal for professional or everyday use
• Comes pre-charged and ready to use, can be fully recharged, back up to 100% capacity, even after 3 years, can be recharged hundreds of times with minimal power or capacity loss
• Long battery life, gradual self-discharge maintains 70% capacity for 6 months and 50% capacity for 12 months

2. Smart Rechargeable Battery Charger for Ni-MH Ni-Cd A AA AAA C SC F6

• Ul certification: our product has been tested, got safety certificate and meets the applicable published standard. the ul mark is proof of product compliance to north american safety standards.
• Safety assurance: comes with special charge and discharge management circuit. with multiple security protection settings, the charger can effectively prevent reverse, short circuit, overcharge, over discharge, over-current damage to the battery, which makes users using the product without any safety concern.
• Intelligent charger: has four independent charging channels, it can charge four lithium batteries at the same time. users can choose different charging current to meet the needs of slow charge or fast charge. and the charger will display the status of each rechargeable battery when charging.
• Strong practicality: can charge for different types of dc 3.7v cylindrical lithium batteries 10440, 14500, 14650, 16340, 16650, 17650, 17670, 18350, 18490, 18500, 18650, 18700, 22650, 20700, 21700, 22700, 25500, 26650, 26700 and 1.2v nimh/nicd aa, aaa, a, c, sc, f6 rechargeable batteries.
• What you get: bo4-pro smart charger, power cord, user manual, warranty card, 24 hours warm service, 60 days free refund, 2 years free replacement, lifetime maintenance. warm tips: this charger with no wall adaptor, you can use any dc 5v/2a adapter. (different input currents will affect the actual charging current. it is recommended to charge with 5v2a.)

3. Fenix are-D1 USB Powered Smart Battery Charger for 21700/18650/16340 with EdisonBright BBX5 Battery

• Usb powered battery charger
• Compatible with battery types 2665021700 1865016340 1450010440 aa aaa c
• Bundle includes edisonbright bbx5 battery carry case
• Batteries not included
• Single charging bay

4. DOTTMON LCD Smart Universal Battery Charger 4 Bay for Rechargeable Batteries AA AAA

• Four slots smart charger: automatically detects battery capacity, select charge mode. automatically adapts to usb input power.
• Universal charger for: ni-mh ni-cd a aa aaa aaaa c d sc battery, 3.6v/3.7v li-ion 26650 25500 22650 21700(only for flat top) 20700 18650 18490 18500 18350 17670 16340 rcr123a 14500 10440 rechargeable batteries.
• Safety performance: protects against reverse, short circuit, overcharge, over discharge, over-current.
• Intelligent detection: it can show the real capacity of the battery without any power after finishing charging.
• Lcd display: the energy-saving lcd screen displays charging voltage (v), charging current (a), charging capacity (mah), battery type (li-ion/nimh). please peel off the protective film on the lcd screen before using.

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

• 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,
• Charge 1 or 2 batteries at the same time
• Bundle includes edisonbright bbx5 battery carry case
• Lcd screen display

6. M&A BD 2 Pack of 40T-Purple, 4000mAh, 30A, Rechargeable, Replacement for 21700-Battery,

• Size: 70.30mm (l) x 21.22mm (d)
• Package: 2 pack of 40t-purple replacement batteries.
• Capacity: 4000mah & max continuous discharge current: 30a
• Style: flat top (no button on top).
• Please check the size and style before you place an order.

7. M&A BD 2 Pack of 50E-Green, 5000mAh, Rechargeable, Replacement for 21700-Battery, for LED

• Capacity: 5000mah & max continuous discharge current: 15a
• Style: flat top (no button on top).
• Please check the size and style before you place an order.
• Package: 2 pack of m&a bd 50e-green batteries & 1 free storage case
• Size: 70.80mm (l) x 21.80mm (d)

8. M&A BD 2 Pack of 4200mAh, Gray-P42A, 45A, Replacement for 21700-Battery, Rechargeable,

• Style: flat top (no button on top).
• Capacity: 4200mah & max continuous discharge current: 45a
• Package: 2 pack of p42a batteries.
• Size: 70.30mm (l) x 21.22mm (d)
• Please check the size and style before you place an order.

9. Miboxer C4 V3 Universal 18650 Charger 4 Slots for Rechargeable Batteries Ni-MH Ni-Cd

• 1.rich lcd display:4 slots charge independently with large lcd screen show the battery internal resistance, capacity, current, battery type, charge mode,charge time and battery percentage,
• 4.charging current setting:the charging current can be set up by manual and automatically,10 gears charging current can be set.
• 2.large charge current:max output current(1.5a*2/1.3a*3/1.0a*4,for li-ion batteries:charge 1-2pcs battery,max current is 1.5a, 3pcs batteries, max current is 1.3a, 4 batteries together, 1a max for each slots for ni-mh/ni-cd: 1a*4 max
• 3.strong compatibility:the slot length up to 78mm, it can compatible with almost all rechargeable cylindrical batteries, like li-ion( 4.25v / 4.35v ) / imr / inr / icr / lifepo4:14500/18650/21700(with protect board)/26650/aa/aaa/sc,support car charging.
• 5.safe and quality assurance:with lifepo4 memory function,with ce,rohs,fcc certificates, 3 years guarantee.

10. NITECORE UMS2 Intelligent USB Dual-Slot Quick Battery Charger for Li-Ion/Ni-MH/Ni-Cd/IMR 16340 14500

• 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
• Perfect for travel and edc - this bundle includes a lumentac battery organizer to keep you organized when you are on the go.
• 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.
• 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).