The Original DIY Battery Company
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The Original DIY Battery Company
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INR21700 4000mAh 3.6V 35A High Rate Li-ion Cells - Overstock!
INR21700 4000mAh 3.6V 35A High Rate Li-ion Cells - Overstock!
INR21700 4000mAh 3.6V 35A High Rate Li-ion Cells - Overstock!
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INR21700 4000mAh 3.6V 35A High Rate Li-ion Cells - Overstock!

$2.00 $0.00

These are overstock INR21700 4000mAh 3.6V high-rate Li-ion cylindrical cells. Of course we get these in large full cases so we will repackage your order into custom packaging for safe shipment. These cells deliver strong continuous discharge in a compact form factor. Since we’re clearing overstock, you can purchase exactly the quantity you need — no minimum cases or fixed packs required. Buy 1, 10, 50, or more!

Specifications

•  Model: INR21700 4000mAh

•  Nominal Voltage: 3.6V

•  Nominal Capacity: 4000mAh (4.0Ah)

•  Max Charge Voltage: 4.20V ± 0.05V

•  Discharge Cut-off Voltage: 2.50V

•  Standard Charging Mode: CCCV, 2.0A to 4.20V (cut-off ~100mA)

•  Max Continuous Charge Current: 6A

•  Max Continuous Discharge Current: 35A (with temperature cut-off)

•  Dimensions (with tube/sleeve): Diameter ≤21.3mm, Height ≤70.3mm

•  Weight: ≤ 70g per cell

IMPORTANT SAFETY NOTICE ⚠️ Lithium-ion batteries require proper handling and knowledge to ensure safe operation. Failure to follow safety guidelines may result in fire, explosion, serious injury, or property damage.

GENERAL SAFETY GUIDELINES

•  Only purchase and use if you fully understand lithium-ion battery safety.

•  Always charge in or on a fire-resistant surface—never leave batteries charging unattended.

•  Use only a compatible smart charger designed specifically for 3.6V/4.2V lithium-ion cells.

•  Store batteries in a protective case—never carry them loose in a pocket, bag, or purse.

•  Keep away from metal objects (keys, coins, tools) to prevent short circuits.

•  Use only within manufacturer-listed specifications and in protected battery packs with a proper BMS.

•  Resellers must provide these warnings to all customers.

PROHIBITED USES & HANDLING

•  DO NOT use this battery in e-cigarettes, vaporizers, or similar devices.

•  DO NOT mix old and new, or used and unused batteries.

•  DO NOT short circuit, puncture, cut, crush, incinerate, or modify the battery.

•  DO NOT use if the battery wrapper is torn or damaged in any way.

•  DO NOT overcharge or over-discharge—this can lead to battery failure or venting.

•  DO NOT expose the battery to liquids, extreme heat, or direct sunlight.

•  DO NOT solder directly—only use spot welding or nickel strips for battery pack assembly.

•  DO NOT exceed 35A continuous discharge

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