Power up your devices with the reliable performance of our 21700 rechargeable battery. Built for endurance and efficiency, this 4000mAh lithium-ion battery delivers consistent output and long-lasting power-perfect for high-drain electronics, flashlights, tools, and more.

Key Features:

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  Battery Type: 21700 Li-ion Rechargeable

  
  



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  Capacity: 4000mAh

  
  



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  Nominal Voltage: 3.63V

  
  



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  Maximum Charging Voltage: 4.2V

  
  



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  Charging Method: Constant Current / Constant Voltage (CC-CV)

  
  

Charging Details:

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  Standard Charging Current: 0.33C (1551mA)

  
  



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  Fast Charging Current: 1C (4700mA)

  
  



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  Charging Time: Approx. 4 hours

  
  



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  CCCV Cut-Off: 0.05C (235mA)

  
  

Discharging Performance:

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  Continuous Discharge Current: 9.4A (9400mA)

  
  



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  Discharge Cut-Off Voltage: 2.5V

  
  

Durability & Cycle Life:

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  Cycle Life: Maintains 3,760mAh after 1000 cycles (80% capacity at room temperature)

  
  

Storage & Operating Conditions:

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  Storage Tolerance: Up to 30 days at 60oC

  
  



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  Recommended Discharge (Storage): 0.2C (940mA) to 2.5V at room temperature

  
  

Specifications:

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  Unit Dimensions: 70.80mm (Length) x 21.25mm (Diameter)

  
  



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  Battery Weight: 69g