DIY Li-ion Battery Case Kit & BMS PCB for 5–20 Cell Power Tools

Rebuild & Repair Your Power Tool Batteries at Home

Bring your worn-out power tool battery packs back to life with this all-in-one DIY Battery Case Kit. Whether you're a hobbyist, electrician, or seasoned DIYer, this kit provides the durable plastic housing shell and a Battery Management System (BMS) charging protection PCB you need to rebuild 5-series lithium-ion battery packs for drills, saws, and other cordless power tools — without replacing the entire battery unit.

Made in Mainland China.

Why Choose This Battery Rebuild Kit?

• Flexible Cell Configurations: Available in 5-core, 10-core, 15-core, and 20-core versions to suit a wide range of battery pack builds.
• Smart BMS Protection Board: Uses a dedicated 5S lithium-ion IC processor to monitor real-time cell voltage, charge/discharge current, and ambient temperature — keeping your batteries safe and performing at their best.
• Multi-Layer Protection: Built-in overcharge protection, over-discharge protection, and short-circuit protection ensure a safer charging and discharging experience.
• Ultra-Low Power Consumption: Working current of approximately 25µA and quiescent current of about 6µA means your battery pack draws minimal standby power.
• Quality Materials: Shell constructed from robust plastic and metal components for a secure, long-lasting fit.
• Cost-Effective Repair: Save money by reusing your existing cells rather than buying a brand-new battery pack.

Technical Specifications

What's in the Box?

• 1× Battery Shell / Housing Kit (BMS PCB included depending on variant)
• Note: Battery cells are NOT included.

Important Notes

• Color may vary slightly due to monitor brightness and lighting conditions.
• Please allow for slight manual measurement deviations in listed dimensions.
• Choosing the correct BMS protection board and applying it correctly is essential to battery longevity and safety.

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For more information on safe lithium battery handling, refer to the U.S. Consumer Product Safety Commission (CPSC) Lithium Battery Safety Guide.

Frequently Asked Questions

Q: Are battery cells included with the DIY battery case kit?

A: No, battery cells (cell cores) are NOT included with this kit. You will need to source your own 18650 or compatible lithium-ion cells separately and insert them into the housing to complete your battery rebuild.

Q: What type of batteries is this BMS PCB designed for?

A: This BMS protection board is designed specifically for 5-series (5S) lithium-ion battery packs, commonly used in cordless power tools. It monitors real-time voltage and current per cell and provides overcharge, over-discharge, and short-circuit protection.

Q: Which cell configuration should I choose — 5, 10, 15, or 20 cores?

A: The configuration you choose depends on your power tool's original battery capacity. More cores mean higher capacity (mAh). Check your original battery pack's cell count or consult your tool's manual to select the correct option for your rebuild.

Q: Is this battery case kit compatible with all power tool brands?

A: This is a universal DIY repair shell kit. Please verify the dimensions and cell count of your original battery pack before purchasing to ensure compatibility with your specific power tool brand and model.