Milwaukee M18 18V Battery Rebuild Kit – 10-Cell 21700, 5S2P BMS & Nickel – No Cells

Milwaukee M18 18V Battery Rebuild Kit – 10-Cell 21700, 5S2P

Rebuild a compatible Milwaukee M18 18V battery pack using ten 21700 lithium-ion cells.

This DIY battery rebuild kit includes the battery housing, battery management circuit board, 0.25 mm conductive nickel components, battery contacts, battery-level indicator parts, springs, screws, and the other internal components shown in the product photos.

Battery cells are not included. This kit is intended for experienced battery builders who will supply, test, match, install, and spot-weld their own 21700 lithium-ion cells.

This is a battery rebuild kit. It is designed for rebuilding a compatible Milwaukee M18-style battery pack using a 10-cell 21700 configuration.

Product Features

• Compatible with Milwaukee M18 18V tools and compatible chargers
• Designed for ten 21700 lithium-ion cells
• 10-cell, 5S2P battery configuration
• Includes battery management circuit board
• Includes 0.25 mm conductive nickel components
• Includes battery housing and electrical contacts
• Includes battery-level indicator components
• Includes springs, screws, and assembly hardware
• Finished capacity depends on the cells selected
• Battery cells are not included
• Assembly service is not included

Battery Capacity

This kit uses a 5S2P configuration. The completed battery capacity will be approximately twice the rated capacity of each individual 21700 cell used.

• Using ten matched 4,000mAh cells may produce approximately 8.0Ah
• Using ten matched 4,500mAh cells may produce approximately 9.0Ah
• Using ten matched 5,000mAh cells may produce approximately 10.0Ah

Actual capacity, current capability, runtime, and performance depend on the cells selected, cell condition, and quality of assembly.

What Is Included

The kit includes the battery housing, BMS circuit board, 0.25 mm conductive nickel components, electrical contacts, battery-level indicator components, springs, screws, and the other parts shown in the product photos.

Please review all product photos carefully to confirm the exact components included.

What Is Not Included

• 21700 lithium-ion cells
• Spot welder
• Battery charger
• Power tool
• Battery assembly service

Assembly Requirements

This product is intended for experienced users familiar with lithium-ion battery construction, cell testing, cell matching, insulation, polarity, series and parallel connections, BMS installation, and spot welding.

The buyer is responsible for selecting suitable high-drain 21700 cells with the correct voltage, capacity, chemistry, discharge rating, and specifications for the intended application.

Use only properly tested and closely matched cells. Do not mix cells of different brands, models, capacities, ages, voltage levels, chemistry, or condition.

Important Safety Information

Improper lithium-ion battery assembly can cause fire, personal injury, equipment damage, or property damage. Proper tools, insulation, testing equipment, safety procedures, and battery-building experience are required.

Always verify cell orientation, polarity, nickel placement, insulation, wiring, pack voltage, and output voltage before connecting the completed battery to a tool or charger.

Additional Parts and Resources

For additional battery-building parts, 21700 cells, conductive materials, connectors, cell holders, and BMS boards, visit RenewSpark.

For helpful battery tools, calculators, technical information, and additional resources, download the RenewSpark Tools app.

Milwaukee and M18 are trademarks of their respective owner. This compatible product is independently manufactured and is not produced, sponsored, or endorsed by Milwaukee.