Wholesale factory price li-ion Cylindrical battery INR21700 3.7V 4000mAh battery cell for flashlight rechargeable battery
Wholesale factory price li-ion Cylindrical battery INR21700 3.7V 4000mAh battery cell for flashlight rechargeable battery
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Item |
Parameters |
Remark |
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Rated Capacity |
Typical |
4000mAh |
standard discharge(0.2C) after standard charge |
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Minimum |
4000mAh |
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|
Alternating Internal Resistance |
≤70mΩ |
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| Nominal Voltage | 3.7V | mean operation voltage | |
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Voltage at end of Discharge |
2.5V |
discharge cut-off voltage |
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Charging at end of Voltage |
4.20V |
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Standard Charge |
Constant Current 0.2C Constant Voltage 4.20V 0.02C cut-off |
charge time:Approx 6.0h |
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Standard Discharge |
Constant Current 0.2C end Voltage 3.0V |
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Fast Charge |
Constant Current 1C Constant Voltage 4.20V 0.02C5A cut-off |
charge time:Approx 2.5h |
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Fast Discharge |
Constant Current 1C end Voltage 3.0V |
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Cycle Characteristic |
2000times(100%DOD) 4000 times(80%DOD) 7000 times(50%DOD) |
the residual capacity is no less than 80% of rated capacity at 1C rate. |
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Maximum Continuous Discharge Current |
2C |
pulse discharge current: 5 C |
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Operation Temperature Range |
Charge:0~55℃ Discharge:-20~60℃ |
60±25%R.H. bare battery |
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Storage Temperature Range |
Less than 1 year:-20~25℃ Less than 3 months:-20~45℃ |
60±25%R.H. at the shipment |
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For any further information, please feel free to contact me!
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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