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

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

  • Product Model: 21700
  • Normal voltage: 3.7V
  • Capacity: 4000mAh
  • Size(mm): 21*70mm

battery

3.7v 4000mah 21700 5C Cylinder lithium polymer lipo batteries


cylindrical lithium ion battery

cylindrical lipo battery

rechargeable lipo battery


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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.


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


cylindrical li ion battery

4000mAh lipo battery

3.7V lipo battery

lipo battery mah

cylindrical lithium ion battery sizes

battery


lipo 3.7 battery

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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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Send an InquiryBack to Home
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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