INR21700-4000 High-Drain 21700 Li-ion Cell
4000mAh | 3.7V | 40A continuous | 80A pulse
Large stock available. Competitive pricing for volume orders.
The INR21700-4000 is a high-drain 21700 lithium-ion cell manufactured by Jiangsu SunPower. It is built for battery packs that need strong continuous current, reliable cycle life, and consistent cell performance.
Key buyer-focused specs
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Nominal capacity: 4000mAh; minimum 3900mAh
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Nominal voltage: 3.7V
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Max continuous discharge: 40A (with 75°C temperature cut)
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Max pulse discharge: 80A (2s)
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Max charge current: 6A; standard charge: 2A
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AC impedance: ≤15.0mΩ at 1kHz, 30% SOC
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Cycle life: ≥300 cycles at 4A/20A; ≥200 cycles at 4A/30A
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Operating temperature: charge 0–50°C; discharge -20–75°C
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Dimensions: ≤21.3mm diameter, ≤70.4mm height; weight ≤68g
Good for high-power applications
Power tools, cordless products, vacuum cleaners, e-bikes/scooters, robotics, energy storage, and other high-drain packs.
Consistent cells for pack assembly
Internal control standards:
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Voltage difference ≤10mV
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Impedance difference ≤2mΩ
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Capacity difference ≤1% of nominal capacity
Safety and documentation
Tested for overcharge, forced discharge, short circuit, crush, thermal abuse, temperature cycling, low pressure, drop, and vibration. Full specification and test data are available on request.
Supply and pricing
We hold large stock and offer favorable pricing for bulk orders. Stable supply is available for pack makers, distributors, and OEM buyers.
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