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3.7v 4000mah 21700 5C Cylinder li-ion battery
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Description:

GEB specializes in the development, production and sales of custom lithium batteries. if you have any questions, please feel free to contact us.

Nominal Voltage 3.7V
Standard Charge Constant Current 0.2C Constant
Voltage 4.20V 0.02C cut-off
Standard Discharge Constant Current 0.2C end Voltage 3.0V

                           
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3.7v 4000mah 21700 5C Cylinder li-ion battery

Item  

Parameters

 

Remark
Rated Capacity Typical 4000mAh standard discharge(0.2C)

Cut-off voltage:2.75V

Minimum 3900mAh
Alternating

Internal Resistance

≤20mΩ
Nominal Voltage  3.7V mean operation voltage
Voltage at end of Discharge 2.5V discharge cut-off voltage
Charging at end of Voltage 4.20V
Standard Charge Constant Current 0.2C Constant

Voltage 4.20V 0.02C cut-off

charge time:Approx 6.0h
Standard Discharge Constant Current 0.2C end Voltage 3.0V
Fast Charge Constant Current 1C Constant

Voltage 4.20V 0.02C5A cut-off

charge time:Approx 2.5h
Fast Discharge Constant Current 1C end Voltage 3.0V
Cycle Characteristic 500times(100%DOD)

600 times(80%DOD)

1000 times(50%DOD)

the residual capacity is no less

than 80% of rated capacity at 1C rate.

Maximum Continuous

Discharge Current

3C pulse discharge current: 5 C
Operation Temperature Range Charge:0~55℃

Discharge:-20~60℃

60±25%R.H. bare battery
Storage Temperature Range Less than 1 year:-20~25℃

Less than 3 months:-20~45℃

60±25%R.H. at the shipment

Warnings:

Do not submerge the battery in the water.
Do not mix fresh batteries with used batteries.
Do not mix batteries with metal stuff together.
Do not insert batteries with the (+) and (-) reversed.
Do not use Efest batteries with defective E-cig mods.
Do not disassemble, dispose in fire, heat or short circuit.
Do not put the battery in a charger or equipment with wrong terminals connected.

 

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