The 21700 battery size is becoming increasingly popular due to its growing range of applications, already replacing 18650 batteries in many areas. This high-drain cell is rated for a constant load of up to 30A and pulse loads of up to 45A. With a capacity of 4000mAh and a discharge current of 30A, the Efest 21700 lithium-ion battery is designed for power tools, garden tools, and applications with high current demands. It is ideally suited for industrial use, model building, battery carriers, flashlights, drones, and more. The cell is encased in a durable shrink wrap by Efest and is marked with essential specifications to ensure greater safety during use.

Product information for the Efest 21700 battery with 4000mAh:
Capacity: 4000mAh
Minimum capacity: 3900mAh
Nominal voltage: 3.6V - 3.7V
Charging cut-off voltage: 4.2V ± 0.05
Discharge cut-off voltage: 2.5V
Max. discharge current (constant): 30A
Max. discharge current (pulse): 45A
Protection electronics: None (BMS)
Positive terminal: Flat (Flat Top)
Diameter: 21.1 mm ± 0.15 mm
Height: 70.1 mm ± 0.2 mm
Weight: 69g ± 1 g
Charging method: CC-CV

Safety notes: Lithium cells must only be operated with protection electronics! Please note that lithium cells should only be used by authorized personnel. Improper handling or short circuits can lead to fire or explosion.

Additional features: Lithium-ion batteries are thermally stable and do not suffer from memory effect. They operate on the basis of lithium and are characterized by a high energy density.

Delivery includes: 1x Efest IMR21700 - 4000mAh lithium-ion battery (The battery is delivered in an Efest paper box).

Technical specifications for "Efest IMR21700 - 4000mAh, Li-ion battery, 3.6V - 3.7V 30A":
Normal charging current/charging time: 0.xx - 2A
Max. charging current/charging time at 4A up to 4A/3h
Operating temperature for charging: 0 °C - 45 °C
Operating temperature for discharging: -20 °C - 60 °C.