Efan 3.7V IMR 21700 3750mAh High Discharge 30/40A Rechargeable Li-ion Battery for Camera LED Hunting Light
Model number: Eizfan 21700 3750mAh battery
Nominal Capacity： 3750mAh
Norminal Voltage ：3.7V
Max discharge current：40A
end voltage(cut off) 2.5V
Battery Type: Li ion Battery
Cycle life: more than 500 cycles
Application: Vape Device , flashlight, Fan
EFAN IMR High Amp 21700 3750mAh Battery Specifications
| Item | Condition / Note | Specification |
|---|---|---|
| Capacity | 0.2C | 3750mAh |
| Nominal Voltage | Average of Std. Discharge | 3.7V |
| Standard Charge | Constant Current | 720mA |
| Constant Voltage | 4.20V ±0.05V | |
| End Current (Cut-off) | 50mA | |
| Fast Charge | Constant Current | 3.7A |
| Constant Voltage | 4.20V ±0.05V | |
| End Current (Cut-off) | 100mA | |
| Max Charge Voltage | — | 4.23V |
| Max Charge Current | — | 3A |
| Charge Time | Charge: 1850mA | Approx 4.0h |
| Fast Discharge | End Voltage (Cut-off) | 2.5V |
| Max.continue discharge current | — | 30A |
| Max.pulse discharge current | — | 40A |
| Weight | Approx. | 82.5g |
| Operating Temperature | Charge | 0–45°C |
| Discharge | -10–60°C | |
| Storage Temperature | 1 Month | -10–60°C |
| 3 Months | -10–45°C | |
| 1 Year | -10–20°C | |
| Dimensions (D × H) | — | D21.78mm(Max) H70.6mm(Max) |
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What products does YiFang offer?
YiFang specializes in batteries, chargers, battery packs, and power solutions, including Li-ion, LiMn (IMR), Ni-MH, and LiFePO₄ batteries.
Does YiFang provide OEM/ODM services?
Yes, we offer flexible OEM and ODM customization, including product design, specifications, and packaging to meet your exact requirements.
What industries use YiFang products?
Our products are widely used in e-cigarettes, UAVs, balance scooters, electric bikes, electronic equipment, toys, flashlights, and other commercial and industrial applications.
What is YiFang’s production capacity?
YiFang operates its own factory with automated production lines, producing up to 100,000 units daily, ensuring consistent quality and timely delivery.
How can I contact YiFang for orders or inquiries?
You can contact us via our website inquiry form, email, or phone. Our team is ready to provide professional guidance and customized solutions.
What industries use YiFang products?
Our products are widely used in e-cigarettes, UAVs, balance scooters, electric bikes, electronic equipment, toys, flashlights, and other commercial and industrial applications.
What industries use YiFang products?
Our products are widely used in e-cigarettes, UAVs, balance scooters, electric bikes, electronic equipment, toys, flashlights, and other commercial and industrial applications.
What warranty and after-sales support does YiFang offer?
We provide 6–12 months warranty, responsive customer support, and global insurance coverage for long-term reliability and customer peace of mind.