21700 battery VS 18650 battery

21700 battery vs 18650:are 21700 batteries better and where the differences?

When it comes to batteries, you will encounter a few common types. The most common are the 18650 and 21700 batteries .There are a few different types that you might use in your electronic devices when it comes to batteries. However, which one is the best?
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In this article, we will compare the 21700 battery vs 18650 battery to help you decide which one is right for you. Keep reading to learn more!

The most common are the 18650 and 21700 batteries

Are 21700 and 18650 the same

There is some confusion about the difference between 18650 and 21700 batteries, but they are different. The 18650 battery is a cylindrical lithium battery that is 18mm in diameter and 65mm in height. The 21700 battery is also cylindrical, but it is slightly larger with a diameter of 21mm and a 70mm height.

Another major difference between the two batteries is their capacity. The 18650 has a capacity of about 2600 to 3600mAh, while the 21700 has a capacity of about 4000 to 6000mAh. This means that the 21700 can last longer than the 18650 before recharging.

Even though these two batteries are used in portable devices, they are certainly not alike. But they both serve a similar purpose: to power our favorite gadgets. Something you might notice about these particular batteries is that while their voltage their voltage measurements in volts for each cell match up closely at 3.2V or 3.7V, respectively, there’s an additional digit somewhere near the end that tells us how many Amp Hours each cell can provide before exhaustion.

Most people agree that 21700 and 18650 batteries are mostly identical in terms of performance. The only real difference is that 21700 batteries tend to be more prominent in size. Therefore, if you are looking for a battery that will give you the best performance, then either type will work just fine.

It is essential to note that the 21700 battery will be slightly too big to fit the holder of the 18650 battery

21700 battery vs 18650, which one is better

Battery capacity is measured in either amp-hours (Ah) or milliamp-hours (mAh). A 21700 battery has a rated capacity of about 4000 to 6000mAh, while a 18650 battery has a rated capacity of about 2600 to 3600mAh. Therefore, the 21700 battery has almost twice the capacity of the 18650 battery.

The main downside to using a 21700 battery is that they are not as standard as 18650 batteries, so they may be harder to find and more expensive. However, with the increasing popularity of 21700 batteries, this is likely to change in the near future.

According to recent market analysis, the most popular 21700 battery is currently the Samsung INR21700-40T lithium-ion battery. It has a high capacity of 4000mAh and outputs a max of 40A, making it perfect for high-drain devices. It also features Samsung’s latest charging technology, allowing fast charging times up to 15 minutes when used with compatible chargers.

There are many great 18650 batteries on the market, but users point out that the best one is the Panasonic NCR18650B lithium-ion battery. A high-quality battery offers excellent performance and long life. In addition, it is reasonably priced compared to some other top brands.

the 21700 battery has almost twice the capacity of the 18650 battery

Do 21700 batteries fit 18650

It is essential to note that the 21700 battery will be slightly too big to fit the holder of the 18650 battery. However, generally speaking, a 21700 battery will fit in a 18650-battery holder, and this might not be ideal for safety or performance reasons.

They are concerns about whether or not a 21700 battery will overheat in an 18650 holder. This should not be an issue for great worry as the two batteries have different shapes and sizes, so they will not make contact and create a short circuit.

The similarities between 21700 and 18650 battery

The similarities between 18650 and 21700 are pretty striking when it comes to batteries. These battery types can be used in various devices requiring a power source, such as flashlights or smoke alarms, but more. They also have relatively high capacity compared with other options, for example like Nickel metal hydride batteries and alkaline batteries.

They are both cylindrical, with a slight difference in length. This extra length allows for more capacity, as the 21700 has a capacity of 6000mAh while the 18650 only has a capacity of 3,600mAh.Both of them are mostly lithium ion batteries.

They are both rechargeable and can be used in devices that require 3.2 or 3.7v power depending on whether it is lithium ternary or lithium iron phosphate power.

All FAQs about 18650 battery and 21700 battery

Here are some frequently asked about these batteries:

Does Tesla use 21700 batteries

Yes, Tesla does use 21700 batteries. The Tesla Model 3 is the first Tesla car to use these batteries. The 21700 battery was specifically designed for the Tesla Model 3. It is a cylindrical battery about 21 millimeters in diameter and 70 millimeters in height. It has a capacity of around 50 kilowatt-hours (kWh). This makes it the highest energy density battery on the market. The company has been testing these cells since early 2018, and the mass production started in 2020.

It is important to know how many 21700 cells that are packed to run the Tesla car. They are stacked in a pack of about 2170 cells to run the Tesla car.

Tesla does use 21700 batteries

Can I use 21700 batteries in my vape

You can use 21700 batteries in your vape. However, it is important to ensure that the battery is compatible with your vape mod, and not all mods are compatible with all batteries.

When using a new battery for the first time, always read the manufacturer’s instructions carefully. Ensure all the necessary information regarding that battery is clear to you and makes you enjoy using your device correctly.

You can use 21700 batteries in your vape

Can a 18650 charger charge 21700

Yes, a 18650 charger can charge a 21700 battery. However, it is essential to note that not all 18650 chargers will be compatible with 21700 batteries, and it is necessary to use a charger designed explicitly for 21700 cells.
When using a 18650 charger to charge a 21700 battery, it is crucial to ensure that the charging current is within the safety limits of the 21700 battery.

Exceeding the safe limits can result in damage or even fire. Always consult the manufacturer’s specifications for safe charging currents for your specific battery type.

What can I use in place of the 18650 battery

There are many types of batteries that can be used in place of 18650 batteries. Some examples include, Some 18650 cells are LiFepo4 cells, and LiPo cells. Each battery type has its advantages and disadvantages. For example, LiPo cells are less expensive but have a shorter lifespan than other cells, and LiFe cells have a long lifespan but are not as powerful as other types of batteries.

Choosing the correct battery for your needs is essential to ensure that your device operates safely and efficiently. To make your device function well, use a battery that will produce the exact power that the 18650 could produce. This will help make your device stay longer. Never taste other batteries for your device without knowing its power output.

Are 18650 and 21700 the same size

They are not the same size. 18650 batteries have a diameter of 18mm and a height of 65mm. 21700 batteries have a diameter of 21mm and a height of 70mm. one can notice the difference just from the look of the 21700 batteries are more comprehensive than the 18650 batteries.

one can notice the difference just from the look of the 21700 batteries are more comprehensive than the 18650 batteries

Can I use a 21700 battery instead of 18650

Yes, you can use a 21700 battery instead of a 18650 battery. However, keep in mind that not all 21700 batteries are created equal, and some are designed for high-drain applications, while others are designed for low-drain applications. Therefore, choosing the correct 21700 battery for your needs is essential. Don’t just pick any battery that could affect the functionality of your device.


The 21700 batteries are becoming more popular in the market today. The 21700 battery offers more power than the 18650, making it perfect for high-drain devices such as electric cars and power tools. While some manufacturers are still releasing compatible products, we expect that 21700 batteries will eventually replace the 18650s as the industry standard.

If you are looking for a powerful and long-lasting battery for your next project, be sure to consider using a 21700. Stay tuned for the next battery article that will help you gain insight about these many innovated lithium-ion batteries.

In addition to discussing the difference between  21700 battery vs 18650, we also compared the difference between 18650 vs 14500 batteries , and the difference between lithium battery vs other batteries, like li-ion vs ni-mh battery, in the hope that you will find it interesting and get useful information.

5 thoughts on “21700 battery vs 18650:are 21700 batteries better and where the differences?”

  1. I think the knowledge shared on this site is very useful and helpful,I really like the content shared on this website

  2. The blog post 21700 battery vs 18650 is very informative and provides valuable insights into the differences between these two types of lithium-ion batteries. It’s interesting to learn that 21700 batteries have a higher energy density than 18650 batteries, which makes them more suitable for high-drain devices like electric vehicles and power tools. The comparison chart provided is also helpful in understanding the

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