21700 NMC battery Cell

What is a 21700 battery?

The 21700 battery is a rechargeable lithium-ion battery with a cylindrical shape and a standard size of 21 mm in diameter and 70 mm in length. It has higher capacity, better energy density and higher efficiency, making it ideal for energy storage systems.

Technical specifications

• Chemistry: 21700 batteries also come in a variety of lithium-ion chemistries, including
  • lithium cobalt oxide (LiCoO₂ – LCO)
  • lithium manganese oxide (LiMn₂O₄ – LMO)
  • lithium nickel manganese cobalt oxide (LiNiMnCoO₂ – NMC)
  • lithium iron phosphate (LiFePO₄ – LFP)
• Voltage: Nominal voltage is usually 3.6V or 3.7V, cut-off voltage 2.5V, floating charge voltage 4.2V.
• Capacity: Capacities range from 3000mAh to 5000mAh.
• Discharge rate (C-rating): The continuous discharge rate (CDR) can reach 45A or higher.

Common applications

21700 batteries are widely used in

• electric vehicles, flashlights, electronic cigarettes, power banks, drills, saws, solar energy storage systems and uninterruptible power supplies (UPS).