18650 Lithium-ion Battery 2S2P pack

NO.

Item

Specifications

4.1

Nominal capacity           

4400mAh           @ 0.2C Discharge 

4.2

Nominal voltage            

7.4V

4.3

Charge current            

Standard Charge : 0.5C

Rapid charge     :1.0C

4.4

Standard Charging method 

0.5C CC(constant current)charge to 8.4V,then CV(constant voltage 8.4V)charge till charge current decline to ≤0.01C

4.5

Charging time             

Standard Charging

Approx 5 hours 

Rapid charge

Approx 2 .5hours

4.6

Max.charge current      

Constant Current 1C Constant Voltage 8.4V 0.01 C cut-off

4.7

Max.discharge current    

Constant current 1.0C end voltage6.0V

4.8

Standard Discharge Current

Constant current 0.2 C  end voltage6.0V

4.9

Discharge cut-off voltage  

6.0V

4.10

Charge cut-off Voltage    

8.40V

4.11

Initial Impedance          

≤150  mΩ

4.12

 Weight                  

Approx:220g

4.13

Operating temperature     

Charging :  0°C~45°C

Discharging: -20°C~70°C

4.14

Storage temperature      

-5°C~35°C

4.15

Storage Humidity         

≤75% RH

4.16

Appearance                

Without scratch,distortion,contamination and leakage

4.17

Standard environmental condition

Temperature             : 23±5°C

Humidity           :45-75%RH

Atmospheric Pressure :86-106 Kpa

No.

Item

Test Methods and Condition

Criteria

5.1

0.2C Capacity

After standard charging, rest battery for 10min,discharging at 0.2C to voltage 3.0V, recording the discharging time.

≥300min

5.2

1C Capacity

After standard charging, rest battery for 10min, then discharging at 1C to voltage 3.0V, recording the discharging time.

≥54min

5.3

Cycle Life

Constant current 0.5C charge to 4.2V, then constant voltage charge to current declines to 0.01C, stay 5min,constant current 0.5C discharge to 3.0V,stay 10min. Repeat above steps till continuously discharging capacity Higher than 80% of the Initial Capacities of the Cells

≥300 times

5.4

Capability of keeping electricity

20±5°C, After standard charging, laying the battery 28days, discharging at 0.2C to voltage 3.0V, recording the discharging time.

≥240min