INR21700-4000mAh-7C
Balanced 21700 cell — high capacity meets high discharge for versatile applications.
Product Overview
The INR21700-4000mAh-7C bridges the gap between energy and power. With 4000mAh capacity and 7C continuous discharge (28A), it delivers 55% more capacity than an 18650-2600mAh at nearly 3x the discharge rate. This cell is our go-to recommendation for applications that need both meaningful runtime and strong current delivery — AGV drive systems, mid-power e-bikes, and portable power stations that need to start motors.
Specifications
| Parameter | Value |
|---|---|
| Model | INR21700-4000mAh-7C |
| Form Factor | 21700 Cylindrical |
| Chemistry | NMC |
| Nominal Capacity | 4000mAh |
| Nominal Voltage | 3.6V |
| Max Continuous Discharge | 7C (28A) |
| Cycle Life | ≥500 cycles (80% retention) |
| Internal Resistance | ≤14mΩ (AC, 1kHz) |
| Dimensions | 21.2mm × 70.1mm |
| Weight | ~68g |
| Operating Temperature | Charge 0°C~45°C | Discharge -20°C~75°C |
Key Features
- 4000mAh + 7C — rare combination of capacity and power
- ≤14mΩ IR — high efficiency even under sustained load
- 500+ cycle life — industrial-grade durability
- 21700 format advantages — fewer cells per pack vs 18650, simpler BMS
Applications
- AGV/AMR drive batteries
- Mid-power e-bikes and e-scooters
- Portable power stations (motor-start capable)
- Robotics battery packs
- Industrial handheld equipment
Why We Chose This Cell
The 21700 format is the sweet spot for many industrial applications — more energy than 18650 without the weight penalty of prismatic cells. At 4000mAh/7C, this cell lets you build a 10S3P pack delivering 432Wh with 84A continuous current. That’s enough to drive a 1kW AGV motor with 25 minutes of runtime. In our evaluation, this cell stood out for its thermal stability at 7C — surface temperature stable at 62°C after 30 minutes.
Certifications
- UN38.3 / MSDS / IEC62133 / CE / RoHS / REACH
FAQ
18650 vs 21700 — which should I choose?
21700 offers higher per-cell energy (fewer cells, simpler BMS). 18650 offers finer granularity and wider accessory compatibility. Contact us for application-specific guidance.
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