M18 18V Battery Rebuild Case & PCB Protection Board for Milwaukee

M18 18V Battery Plastic Case & PCB Charge Protection Circuit Board — Compatible with Milwaukee 48-11-1815

Give your Milwaukee M18 power tool battery a second life with this complete rebuild kit. This listing includes a brand-new plastic outer shell and a PCB charge protection circuit board — no battery cells are included. Designed for experienced DIY technicians and battery repair professionals who want to restore a 3Ah, 6Ah, or 9Ah Milwaukee 18V battery pack using their own 18650 lithium-ion cells.

⚠️ Important Notice: This product does NOT contain battery cells. It is a shell and circuit board only, intended for persons with hands-on experience in lithium-ion battery assembly. If you are not familiar with battery pack assembly, voltage balancing, and spot welding, please do not order this product.

What's Included

• Plastic outer case — compatible with Milwaukee M18 48-11-1815 battery form factor
• PCB charge protection circuit board — provides overcharge, over-discharge, and short-circuit protection
• Case stickers / labels — for a clean, professional finish
• Available in three configurations: 5 × 18650 (approx. 3Ah), 10 × 18650 (approx. 6Ah), 15 × 18650 (approx. 9Ah)

Key Features

• 100% brand new — aftermarket replacement components
• Compatible with Milwaukee M18 platform tool battery housings
• PCB board supports 18650 lithium-ion cell configuration (5S/10S/15S arrangements)
• Integrated charge protection: guards against overvoltage, undervoltage, and overcurrent conditions
• Durable ABS plastic shell designed to the original Milwaukee M18 battery dimensions
• Includes authentic-style case stickers and labels for a finished look

Assembly Instructions & Notes

1. Use 18650 power-grade lithium-ion cells only.
2. For new cells: ensure all cells in a group (5, 10, or 15) are matched in internal resistance and charged to the same voltage before assembly.
3. For rebuilt/used cells: test the voltage at both ends of each cell and equalize all cells to the same voltage before welding.
4. Critical: All cells MUST be at the same voltage before soldering or spot-welding the PCB into place.
5. Refer to the circuit board connection diagram (see product images) for proper wiring layout.

Made in Mainland China.

For general electrical safety guidance when working with lithium-ion battery systems, refer to the U.S. Consumer Product Safety Commission (CPSC) — Lithium-Ion Battery Safety.

For workplace safety when handling and assembling battery packs, see OSHA Electrical Safety Resources.

Frequently Asked Questions

Q: Does this M18 battery rebuild kit include 18650 lithium-ion cells?

A: No. This kit includes only the plastic outer shell, the PCB charge protection circuit board, and case stickers/labels. You must supply your own 18650 lithium-ion power cells separately. Please do not order if you require a ready-to-use battery pack.

Q: Which Milwaukee battery models is this case compatible with?

A: This plastic case and PCB board are designed to be compatible with Milwaukee M18 18-volt battery packs, specifically referencing the Milwaukee 48-11-1815 form factor. It supports rebuild configurations of 5, 10, or 15 × 18650 cells, corresponding to approximately 3Ah, 6Ah, and 9Ah capacity packs.

Q: What does the PCB charge protection circuit board do?

A: The PCB (Printed Circuit Board) protection module monitors the lithium-ion cells and protects against overcharging, over-discharging, overcurrent, and short-circuit conditions. It is an essential safety component in any lithium-ion battery pack rebuild and helps extend the life of your cells.

Q: Is prior experience required to assemble this battery rebuild kit?

A: Yes. This product is intended strictly for individuals who are experienced with 18650 lithium-ion battery pack assembly, including voltage balancing, spot welding or soldering, and PCB wiring. Improper assembly of lithium-ion cells can be dangerous. If you are not confident in your technical abilities, please seek professional assistance.