Lithium-ion batteries are becoming increasingly popular due to their high energy density and ability to be recharged. These batteries are commonly used in portable electronic devices, such as smartphones and laptops, but they are also to be used in larger applications, such as electric vehicles. Thats right, essentially the same batteries used in your laptop, power a Tesla!

One type of lithium-ion battery that is gaining popularity is the cylindrical lithium-ion battery. These batteries are shaped like a cylinder, which makes them well-suited for use in a variety of applications. Common sizes are 18650, 21700 and 26650, the first two numbers denote the diameter, the second two numbers denote the length and the final zero tells you that it's cylindrical. An 18650 for example is 18mm x 65mm.  

One of the main benefits of cylindrical lithium-ion batteries is their high energy density. This means that they can store a large amount of energy in a relatively small space. This is important for applications where space is limited, such as in smartphones and laptops or where portability is key.

Another benefit of cylindrical lithium-ion batteries is their ability to be recharged. Unlike traditional batteries, which must be disposed of after they are used, lithium-ion batteries can be recharged hundreds or even thousands of times. This makes them an environmentally-friendly option, as they reduce the need for disposable batteries.

Cylindrical lithium-ion batteries are also known for their durability. They can withstand a wide range of temperatures and can be used in a variety of environments. This makes them well-suited for use in applications where the battery must be able to withstand harsh conditions, such as in outdoor equipment or in vehicles.

In conclusion, cylindrical lithium-ion batteries are a popular choice due to their high energy density, ability to be recharged, durability, and versatility. These batteries are well-suited for use in a variety of applications, from portable electronic devices to larger applications such as electric vehicles. You are likely surrounded by these batteries on a daily basis as they form an important part of everyday life.