Molicel INR21700-P42A 4200mAh 45A Li-ion Battery for Power Tools, E-Bikes & DIY Battery Packs (1-100 PCS)

The Molicel INR21700-P42A 4200mAh 45A Continuous Discharge 21700 Li-ion Rechargeable Battery is widely celebrated as one of the most reliable and capable ultra-high-drain 21700 cylindrical cells ever engineered, manufactured by E-One Moli Energy (Molicel) and supplied by DXF POWER with strict quality grading. Designed for demanding applications requiring massive power delivery and exceptional thermal endurance, this flat-top bare cell delivers 4200mAh nominal capacity on a 3.6V nominal platform with an extraordinary 45A constant continuous discharge capability and low internal resistance. Known for its perfect balance of high capacity, continuous current handling, and long cycle life, the P42A is the industry standard for electric bikes, high-performance battery packs, cordless power tools, robotics, and custom DIY battery builds.

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Key Features

• Genuine Molicel INR21700-P42A Cell: Authentic Grade-A 21700 cylindrical cell engineered by E-One Moli Energy for extreme high-drain reliability
• 4200mAh High Capacity: Large 4200mAh nominal capacity provides substantial runtime while maintaining high-current discharge stability
• 45A Constant Continuous Discharge: Massive 45A continuous discharge rating delivers uncompromising power output without thermal throttling
• Low Internal Resistance: Minimizes operating heat buildup, maximizes power transfer efficiency, and maintains high voltage under load
• Outstanding Thermal Stability: Engineered to withstand sustained heavy current draws with superior thermal control and longevity
• Standard 21700 Flat-Top Design: Standard dimensions of 21.4 mm diameter × 70.2 mm length and ~67 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: Molicel (E-One Moli Energy / Supplied by DXF POWER)
• Model / Part No.: INR-21700-P42A (P42A)
• Cell Format: 21700 Cylindrical Rechargeable Lithium-ion (INR)
• Positive Pole: Flat (Flat Top)
• Protection Circuit: Without (Unprotected industrial bare cell; requires compatible BMS / protection circuit)
• Nominal Capacity: 4200mAh
• Nominal Voltage: 3.6V
• Max. Charge Voltage: 4.2V
• Discharge Cut-Off Voltage: 2.5V
• Continuous Discharge Rating: 45A
• Charging Method: Constant Current / Constant Voltage (CC-CV)
• Cell Dimensions: Diameter: approx. 21.4 mm × Length: approx. 70.2 mm
• Cell Weight: Approx. 67.0 g
• Applications: High-performance battery packs, electric bikes & scooters (e-bikes), heavy-duty power tools, energy storage systems, racing & motorsports, and custom DIY lithium projects

Package Includes

• Molicel INR21700-P42A 4200mAh 45A 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 – Portable High-Drain Modules: Ideal for high-output dive lights, drone gear, and compact robotics
• 20 PCS – High-Power Mobile Modules: Perfect for 18V/24V cordless power tool battery rebuilds and portable power modules
• 50 PCS – E-Bike & Scooter Battery Packs: Optimized quantity for assembling high-current 36V/48V light 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 45A.
• 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 Molicel INR21700-P42A cells with authentic 4200mAh capacity and 45A continuous output
• Industry-standard high-drain chemistry with proven thermal stability and long cycle life
• 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 e-bike builders, power tool rebuilders, and DIY pack fabricators demanding authentic 45A continuous discharge, 4200mAh capacity, and robust thermal endurance for demanding electric mobility, heavy-duty cordless equipment, and custom energy modules.

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