EVE INR21700-40P 4000mAh 40A Li-ion Battery for Power Tools, E-Bikes & DIY Battery Packs (1-100 PCS)

The EVE INR21700-40P 4000mAh 40A Continuous Discharge 21700 Li-ion Rechargeable Battery is an industrial powerhouse cell manufactured by EVE Energy and supplied by DXF POWER with strict quality grading. Built for extreme current demands, this flat-top bare cell delivers a generous 4000mAh nominal capacity on a 3.6V nominal platform with a formidable 40A (10C) continuous discharge rating and an ultra-low internal resistance of just 9.1 mΩ. Supporting high-speed charging up to 6A, the EVE 40P minimizes voltage sag under aggressive power loads while maintaining superior thermal stability, making it one of the most capable 21700 bare cells on the market for cordless heavy-duty power tools, high-performance electric motorcycles, e-bikes, and custom DIY battery packs.

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Key Features

• Genuine EVE INR21700-40P Cell: Authentic Grade-A 21700 cylindrical bare cell manufactured by global lithium-ion leader EVE Energy
• 4000mAh High-Drain Capacity: 4000mAh nominal capacity provides an exceptional balance of substantial runtime and massive current output
• 40A Continuous Discharge (10C): Massive 40A continuous discharge rating delivers uninterrupted power for heavy motor drives and high-wattage equipment
• Ultra-Low Internal Resistance (9.1 mΩ): Minimal internal impedance ensures exceptional voltage retention under sustained maximum loads
• Rapid 6A Fast Charging: Supports up to 6A maximum charging current for fast turnaround times in high-demand environments
• Premium INR Chemistry: Lithium-Nickel-Manganese-Cobalt chemistry engineered for thermal resilience and cycle longevity
• Standard 21700 Flat-Top Design: Dimensions of 21.2 mm diameter × 70.0 mm length and ~68 g weight, ideal for precision spot welding and pack fabrication
• Multiple Pack Bundles: Available in 1, 10, 20, 50, and 100 piece packages for individual tool repairs or volume battery assembly
• Strict Factory Quality Testing: Cells are inspected for voltage balance, internal resistance, and capacity consistency across every batch

Specifications, Per Battery

• Brand / Manufacturer: EVE (EVE Energy Co., Ltd. / Supplied by DXF POWER)
• Model / Part No.: INR21700-40P (40P)
• Cell Format: 21700 Cylindrical Rechargeable Lithium-ion (Li-ion)
• Cell Chemistry: Lithium-Nickel-Manganese-Cobalt (INR)
• Positive Pole: Flat (Flat Top)
• Protection Circuit: Without (Unprotected industrial bare cell; requires compatible BMS / protection circuit)
• Nominal Capacity: 4000mAh
• Nominal Voltage: 3.6V
• Charging Voltage: 4.20V
• Discharge Cut-Off Voltage: 2.50V
• Continuous Discharge Current: 40A continuous (10C rate)
• Internal Resistance: Approx. 9.1 mΩ
• Maximum Charging Current: 6A (CC-CV)
• Rechargeable: Yes
• Cell Dimensions: Diameter: 21.2 mm × Length: 70.0 mm
• Cell Weight: Approx. 68 g
• Applications: Heavy-duty cordless power tools, electric motorcycles, high-power electric bicycles (e-bikes), electric skateboards, lawn and garden machinery, and custom DIY battery packs

Package Includes

• EVE INR21700-40P 4000mAh 40A battery cells, quantity chosen from 1, 10, 20, 50, or 100 PCS
• Protective packaging / cell box
• User manual and battery safety guide

Choose Your Ideal Power Bundle

• 1 PCS – Single Cell Replacement: Quick replacement for high-drain torches, individual test benches, or handheld tools
• 10 PCS – High-Power Tool Modules: Ideal for building heavy-duty 5-cell / 10-cell 18V-20V cordless power tool packs
• 20 PCS – High-Output Mobile Modules: Perfect for 36V/40V lawn mowers, industrial power equipment, and robotics
• 50 PCS – E-Bike & Motorcycle Battery Packs: Optimized quantity for assembling high-current 48V/60V/72V electric vehicle packs
• 100 PCS – Volume Assembly Bulk Set: Best value for workshops, battery rebuilders, and custom pack manufacturers

Purchasing in bundles ensures matched cell batches for balanced series and parallel assembly.

180-Day Warranty & Customer Support

Every cell batch supplied by DXF POWER is covered by a 180-day manufacturer warranty against defects in materials and craftsmanship. Our technical support team is always available to assist with charging parameters, pack layout recommendations, and safety practices.

Usage & Safety Guidelines

• Use a dedicated lithium-ion smart charger supporting CC/CV charging mode up to 4.20V.
• Never charge above 4.25V per cell or discharge below 2.50V per cell.
• Never exceed the maximum continuous discharge current of 40A.
• Always inspect cell outer shrink wrap, insulator ring, and terminals for damage before use; rewrap immediately if damaged.
• Never carry loose 21700 batteries in pockets, bags, or purses with metal objects like keys or coins; practical storage in an insulated battery case is essential.
• Do not short-circuit, crush, incinerate, puncture, or submerge cells in water.
• Store batteries at 3.60V–3.85V per cell in a cool, dry, well-ventilated location away from direct sunlight.
• When building multi-cell packs, always integrate a quality Battery Management System (BMS) with over-current, over-charge, over-discharge, and thermal balance protection.

Why Choose DXF?

• Genuine Grade-A EVE INR21700-40P cells with authentic 4000mAh capacity and 40A continuous output
• High-discharge INR chemistry with ultra-low 9.1 mΩ internal resistance and 6A rapid charging
• Carefully matched batches for balanced series and parallel pack assembly
• Strict factory pre-shipment quality checks and secure protective packaging
• Global warehouse logistics network and professional technical customer support

Perfect For

Engineered for power tool rebuilders, EV mechanics, and DIY pack fabricators demanding extreme 40A continuous discharge, 4000mAh capacity, and ultra-low internal resistance for heavy-duty tools, high-speed electric mobility, and custom energy modules.

Power your projects with trusted EVE performance. Learn more about setups and battery care on the DXF YouTube channel.