Efest Battery IMR 18650 V1 3500mAh
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Description
Efest IMR 18650 V1 3500mAh – 10A CDR | 20A Pulse
The Efest IMR 18650 V1 3500mAh is an IMR lithium-ion battery designed for extended runtime under moderate load conditions. This model offers a high 3500mAh capacity with a realistic continuous discharge rating of 10A.
This cell is intended for low to mid-power applications – particularly in regulated mods operating within reasonable wattage ranges.
Technical Specification (according to manufacturer data)
| Parameter | Value | Operational Notes |
|---|---|---|
| Model | IMR 18650 V1 | Flat Top |
| Rated Capacity | 3500mAh | Extended runtime profile |
| Nominal Voltage | 3.7V | Standard Li-ion |
| Discharge Cut-off Voltage | 2.5V | Lower operational limit |
| Continuous Discharge (CDR) | 10A | Realistic sustained current |
| Plus Discharge (Pulse) | 20A | Short-duration pulses only |
| Maximum Charging Current | 4A | Do not exceed |
| Standard Charge | 2A | Recommended charging current |
| Charging Temperature Range | 0°C – 45°C | Do not charge outside this range |
| Discharging Temperature Range | -20°C – 75°C | Operating conditions |
| Dimensions | 18.50mm × 65.20mm | Standard 18650 format |
Recommended Power Range
- Single battery: up to approximately 25–30W (safe range for 10A CDR)
- Dual battery: up to approximately 50–60W total output
Exceeding these values may result in excessive heat generation and reduced cell lifespan.
Usage Characteristics
Due to its relatively low continuous discharge rating (10A), this model is not intended for high-wattage or high-drain configurations. Its primary advantage is the 3500mAh capacity, providing extended runtime under moderate load conditions.
More noticeable voltage sag may occur under heavier loads compared to 20A+ rated cells.
Certification
This product carries CE, RoHS, FCC and MSDS certification according to the manufacturer’s declaration.
Safety Notice
Battery Safety Warning
Lithium-ion batteries can pose fire or thermal event risk if damaged, short-circuited, or improperly charged.
- Never carry loose batteries in pockets.
- Do not use cells with damaged wraps.
- Avoid contact with metal objects.
- Use dedicated 18650 battery chargers only.
- Discontinue use if overheating occurs during normal load.
FAQ – Efest IMR 18650 V1 3500mAh
Is 20A the continuous rating?
No. 20A is the pulse discharge rating. The realistic continuous discharge rating (CDR) is 10A. Always plan your setup based on the 10A continuous limit.
Can I use this battery at 50W?
In a single battery device, 50W is not recommended. With a 10A CDR, the safe practical range is approximately 25–30W. In dual-battery regulated devices, load sharing allows higher total wattage.
Is this suitable for mechanical mods?
This cell is not recommended for mechanical or bypass devices. It should only be used in regulated devices with full protection circuitry.
What happens if the battery wrap is damaged?
Stop using the battery immediately. Damaged insulation increases the risk of short circuit. The cell should be re-wrapped professionally or properly recycled.
WEEE Ireland – Find a Battery Recycling Point
This product is intended for adults aged 18+ in Ireland.
Last updated: 19 February 2026 – data verified against official Efest manufacturer specifications.