What advantage 21700 battery vs 18650 battery?

- Feb 17, 2018 -

What's the amazing 21700 battery vs. 18650 battery?


21700 battery:

the physical size of a cylindrical cell is increased not only by increasing the energy density, but also in reducing the performance of cycle life and multiplying. 


It is estimated that 21700 battery cycle life will decrease by about 20% when the capacity is increased by 10%, compared with 18650 battery.


21700 battery charge discharge ratio is reduced by 30~40%, but the battery will have a temperature rise of about 20%.


Battery modelSize(mm*mm)Capacity(mAh)Weight(g)Energy Density(Wh/kg)
1865018*652200-350045-48250
2170021*703000-480060-65300


both advantage and disadvantage of 21700 battery list above.