21700 VS 18650 battery

Major differences between 21700 vs 18650 battery

There are many differences between 21700 and 18650 batteries. Some of these differences include:

Power output

When choosing which type of lithium-ion battery to buy for your device, you should consider how much power output you need. If you know that the application will require a lot of energy and you don’t want something too bulky or heavy, then it would be best to go with 21700 cells over 18650.

Battery cell weight

21700 batteries weigh around 60g, compared to around 48g for 18650. But their weight can vary depending on specifications.


You should consider the price difference between the two types- 21700s tend to be more expensive than 18650 batteries. This is because the 21700 battery is newer and has more features than the 18650.

Energy Density

21700 batteries have a higher energy density than 18650.

The capacity

The 18650 is one of the most popular types of rechargeable lithium-ion batteries, 18650 has a capacity of 2600-3500mAH while the 21700 can reach up to 5000mAH, which means 21700 cylindrical li-ion cells have more energy density, which can result in more runtime.


Additionally, 18650 batteries are more susceptible to damage from external factors such as heat and pressure.


18650 batteries measure 65mm in length and 18 mm in diameter while 21700 batteries are 70mm long and 21mm wide. The dimensions of the two types vary greatly, with one being significantly longer than the other. This is because of their different capacities—the larger capacity of the 21700 lithium-ion allows it to be larger in size and have high power.

Are 21700 batteries better than 18650?

21700 batteries are newer and larger than 18650. They offer more capacity and discharge at higher currents. 21700 batteries also have a longer cycle life. However, they are more expensive and may not fit in all devices that use 18650 batteries.

So, what’s the verdict? If you need the extra capacity and discharge current, go with a 21700 battery. If you’re looking to save some money or your device only takes 18650 batteries, stick with the 18650.

Can you charge 21700 batteries in a 18650 charger?

The quick answer is yes, you can charge 21700 batteries in a 18650 charger. However, we recommend using a dedicated 21700 charger whenever possible for the best results.

Does 21700 last longer than 18650?

The simple answer is yes, 21700 batteries typically last longer than 18650 batteries. One of the main reasons that the 18650 lithium-ion battery is less powerful than the 21700 is that they have a lower capacity and energy densities are lower.

This means that they can’t store as much energy as 21700 lithium-ion, which can result in less runtime.

It is important to note that the longevity of a battery depends on a variety of factors, including the frequency of usage, storage, and type of device that use it. So, while 21700 batteries may typically last longer than 18650 batteries, there are no guarantees.


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If you have different opinions and suggestions on our articles, welcome to contact us for further discussion!

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Written by Anky Technology Co., Ltd.  

A professional 4G WiFi solar camera enterprise located in Shenzhen China!