EVE INR21700-40P 4000mAh 50A Li-ion Battery for Power Tools, E-Bikes & DIY Battery Packs (1-100 PCS)

The EVE INR21700-40P 4000mAh 50A Continuous Discharge 21700 Li-ion Rechargeable Battery is an ultra-high-drain cylindrical bare cell manufactured by EVE Energy and supplied by DXF POWER with strict quality grading. Engineered for extreme-drain applications demanding ferocious power delivery without compromising cell stability, this flat-top bare cell delivers a solid 4000mAh capacity on a 3.7V nominal platform with a massive 12.5C (50A) maximum continuous discharge rating. Featuring an ultra-low internal impedance (≤13mΩ) and an impressive cycle life (≥600 cycles), the EVE 40P is the premier choice for high-draw cordless power tools, high-performance electric bicycles (e-bikes), electric skateboards/scooters, and custom DIY battery packs.

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Key Features

• Genuine EVE INR21700/40P Cell: Authentic Grade-A 21700 high-power cylindrical cell manufactured by leading producer EVE Energy
• 50A (12.5C) Continuous Discharge Output: Extreme 50A continuous discharge capability engineered for severe, high-drain loads without thermal runaway
• Ultra-Low Internal Impedance: Initial internal AC impedance ≤13mΩ ensures lightning-fast power transfer and minimal voltage sag under load
• 4000mAh High-Drain Capacity: Generous 4000mAh capacity balances heavy current delivery with reliable operating runtime
• Long Cycle Life: Engineered for ≥600 charge/discharge cycles for sustained heavy-duty performance
• Standard 3.7V Platform: CC-CV charging profile up to 4.20V with a broad working voltage range of 2.50V to 4.20V
• Standard 21700 Flat-Top Design: 21.15 mm diameter × 70.15 mm height and ~70 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 replacements or large-scale pack fabrication
• Strict Factory Quality Testing: Cells are inspected for voltage balance, internal resistance, and capacity consistency across every batch

Specifications, Per Battery

• Brand / Manufacturer: EVE Energy (Supplied by DXF POWER)
• Model / Part No.: INR21700/40P (EV-INR21700-40P / 40P)
• Cell Format: 21700 Cylindrical Rechargeable Lithium-ion (Li-ion)
• Cell Chemistry: INR / Li-ion (Lithium Nickel Manganese Cobalt Oxide)
• Positive Terminal: Flat (Flat Top)
• Protection Circuit: Without (Unprotected industrial bare cell; requires compatible high-current BMS / protection circuit)
• Nominal Capacity: 4000mAh
• Nominal Voltage: 3.7V
• Working Voltage Range: 2.50V - 4.20V
• Charge Termination Voltage: 4.20V ± 0.05V
• Discharge Cut-Off Voltage: 2.50V
• Maximum Continuous Discharge Current: 12.5C (50A continuous)
• Initial Internal Impedance: ≤13mΩ
• Cycle Life: ≥600 cycles
• Charging Method: Constant Current / Constant Voltage (CC-CV)
• Rechargeable: Yes
• Cell Dimensions: Diameter: 21.15 mm × Height: 70.15 mm
• Cell Weight: Approx. 70 g
• Applications: Cordless power tools (drills, grinders, impact drivers), high-speed electric scooters/e-bikes, electric skateboards, lawn equipment, and custom high-drain DIY battery packs

Package Includes

• EVE INR21700-40P 4000mAh 50A 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-Output Tool Packs: Ideal for rebuilding power tool batteries and high-rate equipment packs
• 20 PCS – Compact High-Drain Modules: Perfect for high-power scooters, robotics, and performance battery packs
• 50 PCS – E-Bike & EV Battery Rebuilds: Sized for assembling and refurbishing standard 36V/48V high-power electric vehicle packs
• 100 PCS – Master Builder Bulk Set: Best value for workshops, custom pack assemblers, and volume battery builders

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 50A.
• 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 50A continuous output
• Ultra-low ≤13mΩ internal impedance for minimal voltage sag under demanding power loads
• 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, high-performance EV builders, and DIY pack fabricators demanding authentic 4000mAh capacity, fierce 50A continuous discharge, and ≤13mΩ ultra-low impedance for extreme-drain cordless and electric mobility applications.

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