Hot selling 21700 3.7V 4000mah rechargeable li-ion Cylindrical battery for -Ebike

Features: 1, Longer storage life than Ni-MH Batteries 2, Light weight and higher energy density than any rechargeable battery 3, Installed IC chip will prevent the battery pack from over charge and over discharge.

  • Model:21700
  • Normal voltage:3.7V
  • Capacity:4000mAh
  • Diameter:21mm
  • Height:70mm
  • Spec: download

Hot selling 21700 3.7V 4000mah rechargeable li-ion Cylindrical battery for -Ebike

battery

Item

 

Parameters

 

Remark

Rated Capacity

Typical

4000mAh

standard discharge(0.2C)

after standard charge

3Minimum

3950mAh

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 


Item

 

Parameters

 

Remark

Rated Capacity

Typical

4000mAh

standard discharge(0.2C)

after standard charge

Minimum

3950mAh

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 


China li-ion battery supplier1543474329617893.jpgli-ion battery manufacturerShenZhen China li-ion batteryli-ion rechargeable batteriesbattery

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


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1,Q: What's the main product in GEB?                                                                       

   A: Rechargeable battery. Li-ion, Lipo battery and power battery pack.

2,Q: What is overcharge?                                                                                             

   A: After charge, tested the batteries' initial state and capacity. Charge to 10.0V at 3C current, then charge to 0.01C at CV mode. Observe changes in battery appearance.

3,Q: What is over discharge?                                                                                       

   A: After charge, test the batteries' initial state. When the batteries are normal, discharge to 0V at 0.5C. Observe changes in battery appearance

4. Q: Can I have a sample order?                                                                                   

  A: Yes, we accept sample order to test and check quality. Batteries can be made as require.

5. Q: Do you have MOQ limit?                                                                                        

  A: Yes, we have MOQ limit for mass production, but it depends on battery model. Please contact us for details.

6. Q: How about the lead time?                                                                                      

  A: Samples will takes 5-7 business days. Mass production will takes 25-30 days. It depends on quantity.

7. Q: How about shipping and delivery time?                                                              

  A: Generally, battery will be shipped via Express, such as DHL, TNT, FedEx and UPS, delivery time is 3-5 business days. Or DDP service, delivery time is 11-15 business days. Airline and sea shipping also available.

8. Q: What about after-sale service?                                                                             

   A: We will offer you 1 year guarantee. If there are any problems, please inform us, we will offer you positive solutions.


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


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