21700 Cylindrcial Cell

The difference between the battery 21700 and 18650 in size, specification capacity and application field. 1, different sizes: 18650 lithium battery, diameter 18MM, length (height) 65MM. The 21700 lithium battery, with a diameter of 21MM and a length (height) of 70MM, is often referred to as a lithium-ion battery; 2, the specification capacity is different; 3, the application field is different;

Product Description

Items	Parameter
Nominal Capacit	3000mAh/COS; 3350mAh/CCE; 3900mAh/CIS; 4000mAh/DOS; 4300mAh/DCS; 4500mAh/DES; 4600mAh/DFS
Cycle Life	3000mAh/COS: 0.5C(CHG) 1.5C(DC) 200cycles≥80% 3350mAh/CCE/4000mAh/DOS/4300mAh/DCS: 0.5C(CHG) 1.5C (DC) 300cycles≥80% 4500mAh/DES/4600mAh/DFS: 0.5C(CHG) 1.5C(DC) 500cycles≥80%
Nominal Voltage	3.7V
Maximum Discharge Current	1.5C
Cell Internal Impedance	28-38mΩ
Diameter	21.7mm
Height	70.3mm
Weight	67.8/68.9/69.7/69.8± 1g
Attestation	CB 、ROHS 、UL 、ISO 、CQC

21700 lithium battery parameters mainly include capacity, voltage, size, weight and so on. The specific parameters are as follows:

Capacity: The capacity of the 21700 lithium battery is usually between 3500mAh and 5000mAh, and there are also different specifications such as 4800mAh and 4950mAh, depending on the manufacturer and product model.
Voltage: The nominal voltage is generally between 3.6V and 3.7V, and the products of different manufacturers may vary slightly.
Size: The size of the 21700 lithium battery is 21mm in diameter and 70mm in length, which is the origin of its name. 13
Weight: The weight is between 67g and 72g, the specific weight may vary by manufacturer and product.
Internal resistance: The AC internal resistance is generally between 11.5mΩ and 20 Mω.
Other parameters: The charge cut-off voltage is usually 4.2V and the discharge cut-off voltage is 2.5V. The continuous large discharge current can reach 10A to 30A, depending on the product model and manufacturer. In addition, the 21700 lithium battery also has a high energy density and a long cycle life, suitable for a variety of electronic devices.