21700 Battery Compared To 18650
When it comes to lithium-ion batteries, there are a few different options available. Two of the most popular options are 21700 and 18650 batteries. But what are the differences between these two types of batteries? In this article, we’ll compare 21700 batteries to 18650 batteries, highlighting the key differences between the two.
Contents
Size and Capacity
One of the main differences between 21700 and 18650 batteries is their size. As the name suggests, the number in the battery’s name refers to its dimensions in millimeters. A 21700 battery is 21mm wide and 70mm long, while a 18650 battery is 18mm wide and 65mm long. Due to their larger size, 21700 batteries have a slightly larger capacity than 18650 batteries.
For example, a typical 21700 battery has a capacity of around 4500mAh, while a typical 18650 battery has a capacity of around 3500mAh. This means that a 21700 battery can store more energy and will last longer than a 18650 battery under the same usage conditions. This can be especially beneficial in applications such as electric vehicles, where long battery life is crucial.
Power and Voltage
Another key difference between 21700 and 18650 batteries is their power and voltage. A typical 21700 battery has a maximum continuous discharge rate of around 20A, while a typical 18650 battery has a maximum continuous discharge rate of around 15A. This means that 21700 batteries can handle higher loads and deliver more power than 18650 batteries. Additionally, 21700 batteries typically have a higher voltage than 18650 batteries, which can also contribute to their ability to deliver more power.
Applications
21700 and 18650 batteries are used in a wide variety of applications, but they have different advantages and disadvantages depending on the specific application. For example, 18650 batteries are widely used in portable devices such as laptops and power banks because of their small size and high energy density. They are also used in many electronic cigarettes and vaporizers. On the other hand, 21700 batteries are often used in larger devices such as electric vehicles and energy storage systems because of their larger capacity and higher power capabilities.
Cost and Availability
When it comes to cost and availability, 18650 batteries tend to be more widely available and are generally less expensive than 21700 batteries. This is partly due to the fact that they have been around longer and are used in a wider range of applications. However, as the demand for larger, more powerful batteries continues to grow, the cost of 21700 batteries is expected to decrease and their availability is expected to increase.
In conclusion, 21700 and 18650 batteries are both lithium-ion batteries, but they have some key differences. 21700 batteries have a slightly larger capacity, can handle higher loads and deliver more power, and are mainly used in larger devices such as electric vehicles and energy storage systems. On the other hand, 18650 batteries are smaller, have a lower capacity, and are widely used in portable devices such as laptops and power banks. The choice between the two will largely depend on the specific application and the specific requirements of the device.
