[2 Pack] 21700 battery 3.7v size 4Ah High-Temp Li-Ion Cell 9.8A cylindrical

Pack of 2 Batteries

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:

• Battery Type: 21700 Li-ion Rechargeable

• Capacity: 4000mAh

• Nominal Voltage: 3.63V

• Maximum Charging Voltage: 4.2V

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

Charging Details:

• Standard Charging Current: 0.33C (1551mA)

• Fast Charging Current: 1C (4700mA)

• Charging Time: Approx. 4 hours

• CCCV Cut-Off: 0.05C (235mA)

Discharging Performance:

• Continuous Discharge Current: 9.4A (9400mA)

• Discharge Cut-Off Voltage: 2.5V

Durability & Cycle Life:

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

Storage & Operating Conditions:

• Storage Tolerance: Up to 30 days at 60°C

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

Specifications:

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

• Battery Weight: 69g (each)
  

Pack of 2 Batteries