The 18650 cell is one of the most popular types of rechargeable lithium-ion batteries, and for good reason. They are readily available and reasonably priced. There are some clear advantages to 21700 lithium batteries over 18650, but they also carry a higher price tag.
While both have their advantages and disadvantages, 21700 battery vs 18650 battery. Which battery should you buy? Keep reading to learn more about the differences between these two types of batteries.

Common similarities between 21700 and 18650 battery

The 21700 and 18650 batteries have several key similarities that make them both great options for LEV (light electric vehicles).
LEVs require high levels of power, so both lithium-ion batteries have a high discharge rate.

Secondly, both the 18650 and 21700 battery packs have the same voltage, which is 3.7 volts. This is the standard voltage for LEV batteries, and it ensures that they are compatible.
They can be used in a variety of climates due to their ability to withstand a wide range of temperatures.
Fourthly, 18650 and 21700 cells are cylindrical.
Finally, both types of batteries have a long lifespan, so they will not need to be replaced as often as other kinds.
You should know how to choose the best 18650 battery for LEV if you are more interested in 18650 cells.
In addition, if you prefer 18650 cells for your LEV, you should know how to choose the best 21700 battery.

Major differences between 21700 vs 18650 battery

Among the differences between 21700 and 18650 batteries are:
Power output
A lithium-ion battery should be chosen based on the amount of power it will provide to your device when choosing one. If you know that the application will require a lot of energy and you don’t want something too bulky or heavy, then 21700 cells would be a better choice.

Battery cell weight
As a general rule, 21700 batteries weigh around 60g compared to 18650 batteries which weigh around 48g. However, their weight can differ depending on their specifications.
Price
21700 batteries tend to be more expensive than 18650 batteries because they are newer and have more features.
Energy Density
21700 batteries have a higher energy density than 18650.
The capacity
Among the most popular types of lithium-ion batteries, the 18650 has a capacity of 2600-3500mAH, while the 21700 can reach 5000mAH, meaning 21700 cylindrical cells have greater energy density and can last longer.
Damage
Furthermore, 18650 batteries are more likely to be damaged by external factors such as heat and pressure.
Dimension
The dimensions of 18650 batteries differ greatly, with one being much longer than the other. 18650 batteries measure 65mm in length and 18mm in diameter, while 21700 batteries are 70mm long and 21mm wide. As a result of their different capacities, they are larger in size and have higher power. The 21700 lithium-ion has a larger capacity, which allows it to be larger in size.

Are 21700 batteries better than 18650？

Compared to 18650 batteries, 21700 batteries are newer and larger. They offer a higher capacity and discharge at higher currents. They also have a longer cycle life. However, they are more expensive and may not fit in all devices that use 18650 batteries.
In conclusion, if you need the extra capacity and discharge current, choose the 21700 battery. If you’re trying to save money or your device only accepts 18650 batteries, choose the 18650 battery.

Can you charge 21700 batteries in a 18650 charger?

It is possible to charge 21700 batteries in an 18650 charger, but we recommend using a dedicated 21700 charger whenever possible.

Does 21700 last longer than 18650?

There’s a simple answer to this question: yes, 21700 batteries last longer than 18650 batteries. The 18650 lithium-ion battery is less powerful because it has a lower capacity and energy density.
Therefore, they can’t store as much energy as 21700 lithium-ion batteries, which can result in a shorter battery life.
There are a number of factors that contribute to the longevity of a battery, including the frequency of usage, storage, and type of device that uses it. So, while 21700 batteries may typically last longer than 18650 batteries, there is no guarantee.

Do 21700 vs 18650 battery have different applications?

Choosing between 21700 and 18650 batteries for maximum efficiency, cost-effectiveness, or power output.
To be effective, you would want something that can last longer, weigh less based on the same energy content, be more weight efficient, and have more power.
The 21700 cells are probably your best choice in this case as they work well with high power output.
Does the size of lithium-ion batteries affect their performance in lightweight and compact applications?
For instance, if you are using a lithium-ion battery in a drone, the lighter the battery, the better.
It would be better to use an 18650 battery in this case because it is lighter and more efficient.

Application of 21700 lithium-ion batteries

Application of 18650 batteries on electronic devices