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26650 vs 18650 Batteries Comparison: Capacity, Dimensions, Equivalents & Brands

26650 vs 18650

With the variety of battery types, brands, sizes, voltages, and names including seemingly random letters and numbers, batteries might be one of the most confusing topics for discussion.

However, understanding the basics just once can help you find a suitable and long-lasting battery for your device that won’t burn or break it.

26650 and 18650 are rechargeable flashlight batteries that are generally Lithium-Ion (Li-ion). Both are some of the most powerful batteries in their class used in devices consuming much power, including flashlights, vape pens, and toys.

Despite being used in similar devices, there is a number of differences between 26650 and 18650 batteries that you need to know about.

Learn more about them from our comparison article!

26650 and 18650 Batteries Quick Comparison

26650 Rechargeable Li Ion Battery 18650 Rechargeable Battery
Contains Lithium Manganese Oxide with a voltage of 3.6 to 3.7 volts and a maximum of 4.4 charging voltage Generally, a Lithium-Ion battery with a maximum of 4.2 volts of charging voltage
Specifically designed to power high-drain devices, including flashlights, toys, vape pens. Mostly used to power flashlights, vape pens, but also other devices.
Charging time takes an average of 4 to 6 hours Charging time takes an average of 4 hours

26650 vs 18650 Batteries: Basic Features

26650 Rechargeable Battery is a rechargeable lithium ion battery capable of generating high voltage to efficiently power high drain devices like tactical flashlights, toys, vape pens, and so on.

The 26650 battery is available in two different types; Protected and Unprotected. The protected battery has a built-in protective circuit that prevents it from overcharging, over-discharging, and shorting.

18650 Rechargeable Li-Ion Battery is a lithium-ion rechargeable battery that generally has a standardized industry size of 3.6/3.7 volts and has between 1200mAh and 3600mAh energy capacity.

There are two types of 18650 batteries: Protected and Unprotected . It is an extremely popular battery source for flashlights. The charge time varies depending on the battery charger and battery type. The average charge time for a 18650 battery is usually 4 hours.

Check the comparison between 18650 and 20700

26650 vs 18650 Batteries: Differences

26650 rechargeable battery with scull on it

The difference between a 26650 rechargeable battery and a 18650 Li-ion rechargeable battery will be discussed, relying on two major factors; Capacity and Size.


This refers to the length of the battery’s life.

A 26650 rechargeable battery has a large capacity of about 5000 mAh (may vary between brands) which enables a long run time between charges. As a result of its high capacity, it can be utilized in variable vape (VV) box mods.

The capacity of a 18650 rechargeable battery, on the other hand, is between 1200mAh and 3600mAh. The capacity of this battery is supported by most vape box mods.


When it comes to size, the main difference between a 26650 rechargeable battery and a 18650 Li-ion rechargeable battery is the diameter. A 26550 battery is 65 mm in length and 26 mm in diameter, while a 18650 battery is 65 mm in length and 18 mm in diameter.

Due to a larger diameter, the total size and weight of the 26650 battery are bigger, so it may not fit in some devices. Check the specifics of your particular product to find out.


A  26650 rechargeable battery and a 18650 Li-ion rechargeable battery can be used alone or with other batteries depending on the purpose of the device to be built or the device to be powered.

However, both batteries come highly recommended for vaping devices, flashlights, toys, and torches.


18650 and 26650 are the two closest alternatives to each other. In some cases, AAA (triple-A), AA (double-A), or 14500 can be used instead of 18650 or 26650 battery. Take into account the differences in power capacity:

  • 18650 or 26650 = 3.6/3.7v (nominal capacity)
  • AA battery – AAA battery = 1.2 – 1.5v

Make sure to check your device characteristics before replacing old with a new battery.

Battery Brands

Some popular brands of 18650 and 26650 rechargeable batteries are:

  • EBL
  • Tokeyla
  • Energizer
  • Panasonic

Amazon’s Best Selling Battery Testers!

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SaleBestseller No. 1
VTECHOLOGY 2Pcs Battery Tester Checker, Universal Battery Checker Model BT-168for AA AAA C D 9V 1.5V Button Cell Batteries Smal Electrical Equipment (Requires No Battery for Operation)
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  • EASY TO USE- identify battery status simply by the analog display needle, "good" (green), "low" (yellow), and "replace/recharge" (red)
  • NOTE : 1. You can simply test battery voltage to determine whether the capacity of the battery is low or high. It won't directly detect the battery capacity precisely 2. Don't forget: The Battery Tester is activated by the battery being checked. Keep test times as short as possible to avoid unnecessary battery drain.
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KONNWEI KW208 12V Car Battery Tester, 100-2000 CCA Load Tester Automotive Alternator Tester Digital Auto Battery Analyzer Charging Cranking System Tester for Car Truck Marine Motorcycle SUV Boat
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Bestseller No. 3
Pgzsy 2 Pack Battery Tester, Universal Battery Checker for AA / AAA / C / D / 9V / 1.5V Button Cell Batteries
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  • PACKAGE CONTENT - 2 Pack battery tester, Opp bag. Weight light and easy to carry.
  • MULTI PURPOSE USE - Can be used to test different type of household batteries like AA, AAA, C, D, 1.5V,9V and 1.5V button type.
  • PRODUCT SPECIFICATIONS - Weight: 3.5 ounces. Dimensions: 4.3*2.4*0.98 in.
  • NOTE - The battery tester is activated by the battery being checked. Keep test times as short as possible, to avoid unnecessary battery drain.
SaleBestseller No. 4
Battery Tester, Dlyfull LCD Display Universal Battery Checker for AA AAA C D 9V CR2032 CR123A CR2 CRV3 2CR5 CRP2 1.5V/3V Button Cell Batteries, 1x AAA Batteries Included
7,322 Reviews
Battery Tester, Dlyfull LCD Display Universal Battery Checker for AA AAA C D 9V CR2032 CR123A CR2 CRV3 2CR5 CRP2 1.5V/3V Button Cell Batteries, 1x AAA Batteries Included
  • HIGH COMPATIBILITY: It is not only suitable for AA, AAA, C, CR123A, D, 9V, N, CR2, CRV3, 2CR5, CR-P2 cylindrical battery testing, but also good for checking a wide variety of button cell batteries
  • CRISP LCD SCREEN: Easy to use analyzer shows what you need to know about your battery’s health, it will accurately shows whether the battery is in poor, weak, or good condition of voltage.
  • QUICK RESULTS: Simply place a battery into the decent battery detector, it will shows you quickly the status of your batteries’ health by the using bars, helps you avoid battery damage from unnecessary recharges. DON'T POWERED BY RECHARGEABLE BATTERY NOR TEST RECHARGEABLE BATTERIES
  • REMARKABLY COMPACT: One of the smallest and lightest portable battery checker. A pocket-friendly compact chassis with an anti-slip finish enables a firm grip in your hand for battery checking.
  • WHAT YOU GET: Dlyfull Universal Battery Tester(1x AAA battery included), welcome guide, & our worry-free 18-month warranty and friendly customer service. A living assistant helps you save money as well as prolong the lifespan of all your batteries.

Amazon’s Best Selling Battery Power Banks!

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SaleBestseller No. 1
Anker Portable Charger, Power Bank, 10K Battery Pack with High-Speed PowerIQ Charging Technology and USB-C (Input Only) for iPhone 15/15 Plus/15 Pro/15 Pro Max, iPhone 14/13 Series, Samsung Galaxy
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SaleBestseller No. 2
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  • 【Multiple Charging Outputs Provide More Options】: The portable charger has 8 Outputs ports 24000mAh capacity, 2 USB 3.0 18W max QC ports, 1 USB 5V 2.4A ports, 1 USB C port 18W max, 2 DC port 12V 10A max, 2 pole and 3 pole output socket each one with 120W running 150W peak. Applies to iPhone, tablet, camera, radio, USB powered night light, mini fan and so on below 120W.
  • 【Easy To Carry】This portable power bank is ultra-small (6.6 x 4 x 3 inches), weighs only 2.3 pounds, and has a hidden handle that takes up no space and can be carried . As an AC power bank, it is an ideal necessity for Outdoor camping, road trips and home emergency power outage.
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SaleBestseller No. 3
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SaleBestseller No. 4
Solar Charger, Power Bank, 42800mAh Portable Charger Power Bank External Battery Pack 5V3.1A Qc 3.0 Fast Charger Built-in Super Bright Flashlight (Orange)
  • Power bank has a large battery capacity of 42800mAh, and uses high-density batteries to load a larger capacity without changing the volume and weight. Whether you are at home or on the road, the mobile power supply can quickly charge your phone, so that your phone away from the trouble of running out of power.
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  • Solar power bank is compatible with all USB devices such as smartphones and tablets. The product has 2 USB output ports, if the device is compatible, it can support the QC3.0 fast charge protocol.Whether you're camping or on your way home, enjoy the convenience of a solar charger. Keep a good mood.
  • Friendly reminder:When the solar panel is being cared for, it will generate current to charge the battery, and the indicator light will flash.Solar charging is affected by the instability of sunshine intensity and duration. The battery capacity of the product is very large, so the charging will be very slow and should be used as an emergency function. For daily charging, please use a charger with a power above 5V2A to charge the device.

Last update on 2023-09-29 / Affiliate links / Images from Amazon Product Advertising API

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