Cylinder Battery The energy density of the 21700Li ion cell is better than that of the 18650 battery. Under existing conditions, the energy density of its 21700 battery system is about 300Wh/kg, which is about 20% higher than the 250Wh/kg of its original 18650 battery system. Using 21700Li ion cell, the increase in energy density of a single battery is much higher than the 20% increase after grouping. After switching to the new 21700 battery, the system can reduce components and weight by 10% compared with the existing battery
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