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By certification 
2 cell lipo battery 4000mah 7.4v 35c rc helicopter/car 2s lipo lithium battery
| Item | Specification | |
| Battery Type | Lipo battery | |
| Nominal Voltage | 7.4V | |
| Nominal Capacity | 4000mah | |
| Size | 136*43*18mm | |
| Weight | 220g | |
| Composed Type (Configuration) | 2S1P | |
| Continuous Discharge | 35C (140A) | |
| Max Burst rate | 70C (280A) | |
| Charging Current | 1-2C recommended (5C Max) | |
| Working Temperature | Charge | 0~45°C,45~85%RH |
| Discharge | -20~60°C,45~85%RH | |
| Protection Functions | Over charge, Over discharge | |
| Over load, Short Circuit | ||
| Plug type | Deans Plug/XT60/EC5/Traxxas | |
| Warranty | 12months | |
| Certificate | CE/ROHS/MSDS/UN38.3 |
|
Cells production process:
First from raw materials--drying--Balling--Mixing--Coating--Electrode drying--calendaring-cutting--punching--stacking—tab welding--short circuit checking-pre-package--electrolyte injection--pre-formation--degassing-gas bag cutting--folding--code printing--formation--aging--finished products.
Q. Can you explain in detail how you match cells for a battery pack before you assembling the pack?
A: We will do the following things before assembling the pack:
a. Select capacity, same capacities cells for one pack
b. Measure the voltage, same voltage cells for one pack(difference is under 0.02v per cell)
c. Measure the inner resistance,same IR cells for one pack (difference is under 1m Ohm)
All above steps are very strict to make sure the pack performance is perfect.
Q:What&rsquos your advantage compared with other suppliers?
A: a. High quality batteries: Our batteries are in enough capacity, and lower in RI,
Before shipment, we will inspect the products and ensure the quality which are well approved by our clients.
b. Better service: We always offer what our clients need. Reply client&rsquos questions timely. Supply best projects solution for clients. We ship out the products on time&hellip
Q: What&rsquos you payment and delivery items?
A: Payment items: By T/T, 50% for deposit, and balance all before shipment. For small
amount, we also accept payment via PayPal.
Q: What company will be used for making the shipments? DHL? UPS or others?
A:Normally, we ship our battery via TNT,UPS and FedEx.
