21700 batteries are the latest lithium-ion batteries, which are larger and more energy-rich than the previous 18650 batteries. These batteries are designed to be used in high energy demanding applications such as electric cars, drones, battery powered motorcycles, etc.

• Capacity:

Type 21700 batteries have a capacity of 3000 mAh to 5000 mAh. This means that these batteries have a higher energy capacity than previous 18650 batteries.

• Tension:

The standard voltage of a 21700 battery is 3.6V, but this voltage can vary from 3.2V to 4.2V depending on the manufacturer and battery model.

• Dimensions:

Type 21700 batteries are 21 mm in diameter and 70 mm in length. It is slightly larger than the previous 18650 batteries, which are 18mm in diameter and 65mm in length. So, users who use 18650 batteries should make sure their device is compatible with 21700 batteries.

Therefore, if you need a new battery for a high-power device, the 21700 type battery can be a great choice because it has a higher capacity and output current limit, as well as a longer life. However, before purchasing a battery, it is important to check that it is suitable for your device and meets your needs. You should also pay attention to the manufacturer's recommendations for battery safety and proper use.