{"product_id":"diy-battery-case-kit-plastic-housing-bms-pcb-5-20-cell-power-tool","title":"DIY Li-ion Battery Case Kit \u0026 BMS PCB for 5–20 Cell Power Tools","description":"\n\u003ch2\u003eRebuild \u0026amp; Repair Your Power Tool Batteries at Home\u003c\/h2\u003e\n\u003cp\u003eBring your worn-out power tool battery packs back to life with this all-in-one \u003cstrong\u003eDIY Battery Case Kit\u003c\/strong\u003e. 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.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhy Choose This Battery Rebuild Kit?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Cell Configurations:\u003c\/strong\u003e Available in 5-core, 10-core, 15-core, and 20-core versions to suit a wide range of battery pack builds.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmart BMS Protection Board:\u003c\/strong\u003e 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.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Layer Protection:\u003c\/strong\u003e Built-in overcharge protection, over-discharge protection, and short-circuit protection ensure a safer charging and discharging experience.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Low Power Consumption:\u003c\/strong\u003e Working current of approximately 25µA and quiescent current of about 6µA means your battery pack draws minimal standby power.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuality Materials:\u003c\/strong\u003e Shell constructed from robust plastic and metal components for a secure, long-lasting fit.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCost-Effective Repair:\u003c\/strong\u003e Save money by reusing your existing cells rather than buying a brand-new battery pack.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eKit Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBattery Plastic Case + BMS PCB\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCell Configurations\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5-core \/ 10-core \/ 15-core \/ 20-core\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic \u0026amp; Metal\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e21V (5S)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSingle Cell Charge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4.25V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eContinuous Discharge Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8–20A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOvercharge Detection Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4.25V per cell\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~25µA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eQuiescent Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~6µA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBatteries Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo (cells not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× Battery Shell \/ Housing Kit (BMS PCB included depending on variant)\u003c\/li\u003e\n  \u003cli\u003e\u003cem\u003eNote: Battery cells are NOT included.\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eColor may vary slightly due to monitor brightness and lighting conditions.\u003c\/li\u003e\n  \u003cli\u003ePlease allow for slight manual measurement deviations in listed dimensions.\u003c\/li\u003e\n  \u003cli\u003eChoosing the correct BMS protection board and applying it correctly is essential to battery longevity and safety.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/sata-power-splitter-cable-1-to-5-18awg-hdd-ssd-extension\"\u003e1 to 5 SATA Power Splitter Cable 18AWG | HDD SSD Extension\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/soldering-iron-kit\"\u003eSoldering \u0026amp; Electrical Tools\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/displayport-to-hdmi-cable-4k-dp-adapter-pc-tv-projector-monitor\"\u003e1.8M DisplayPort to HDMI Cable 4K DP Adapter – PC TV Monitor\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on safe lithium battery handling, refer to the U.S. Consumer Product Safety Commission (CPSC) Lithium Battery Safety Guide.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Are battery cells included with the DIY battery case kit?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What type of batteries is this BMS PCB designed for?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Which cell configuration should I choose — 5, 10, 15, or 20 cores?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this battery case kit compatible with all power tool brands?\u003c\/h4\u003e\n\u003cp\u003eA: 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.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Are battery cells included with the DIY battery case kit?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No, battery cells (cell cores) are NOT included with this kit. 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