{"product_id":"makita-21v-battery-protection-replacement-board-balanced-bms-temperature-control","title":"Makita 21V Battery Protection Board – Balanced BMS \u0026 Temp Control","description":"\n\u003ch2\u003eMakita 21V Battery Protection Replacement Board with Balanced BMS \u0026amp; Temperature Control\u003c\/h2\u003e\n\u003cp\u003eKeep your Makita 21V power tool batteries running safely and efficiently with this high-quality \u003cstrong\u003eBattery Management System (BMS) Protection Replacement Board\u003c\/strong\u003e. Designed specifically for 5-cell (5S) lithium-ion battery packs, this board features built-in cell balancing and temperature control using 5MOS 3-alloy construction — delivering reliable, long-lasting protection for your valuable battery packs.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're rebuilding a worn-out battery or upgrading your existing protection circuit, this replacement board is an essential component for DIY battery repair and maintenance.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible with:\u003c\/strong\u003e Makita 21V 5S lithium-ion battery packs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBalanced Protection:\u003c\/strong\u003e Active cell balancing ensures all cells charge and discharge evenly for maximum pack longevity\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Control:\u003c\/strong\u003e Built-in thermal protection prevents overheating and safeguards your battery cells\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5MOS 3-Alloy Design:\u003c\/strong\u003e High-quality MOSFET configuration for stable and efficient power management\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOvercharge \u0026amp; Over-discharge Protection:\u003c\/strong\u003e Automatically cuts off current at unsafe voltage levels\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShort-Circuit Protection:\u003c\/strong\u003e Instantly disconnects in the event of a short circuit\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLightweight:\u003c\/strong\u003e Single set weight of just 30g — minimal added bulk to your battery pack\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage Range:\u003c\/strong\u003e USB 5–20V DC compatible\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Individually bagged for safe delivery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccessory Type:\u003c\/strong\u003e Battery Protection \/ BMS Board\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplicable Voltage:\u003c\/strong\u003e 21V (5S Li-ion)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 30g per unit\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Included:\u003c\/strong\u003e No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharger Included:\u003c\/strong\u003e No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho Is This For?\u003c\/h3\u003e\n\u003cp\u003eThis replacement board is ideal for electronics hobbyists, power tool repair technicians, and DIY enthusiasts who want to restore a Makita 21V battery pack to full, safe working condition without purchasing an entirely new battery. Replacing a faulty BMS board is a cost-effective way to extend the life of your battery pack.\u003c\/p\u003e\n\n\u003ch3\u003eSafety \u0026amp; Electronics Resources\u003c\/h3\u003e\n\u003cp\u003eFor general safety guidance on lithium-ion batteries and consumer electronics, visit the U.S. Consumer Product Safety Commission (CPSC) – Lithium-Ion Battery Safety.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Is this Makita 21V BMS replacement board compatible with all Makita battery models?\u003c\/h4\u003e\n\u003cp\u003eA: This board is designed for Makita 21V 5-cell (5S) lithium-ion battery packs. Please verify your battery pack's cell count and voltage rating before purchasing to ensure compatibility with your specific Makita battery model.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What does the \"balanced protection\" feature do on this battery protection board?\u003c\/h4\u003e\n\u003cp\u003eA: The balanced protection (BMS balancing) function monitors the voltage of each individual cell in the battery pack and redistributes charge evenly across all 5 cells. This prevents any single cell from overcharging or over-discharging, which significantly extends overall battery life and maintains consistent performance.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this board include temperature protection for Makita batteries?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The built-in temperature control feature monitors the heat levels within the battery pack and will cut off the circuit if temperatures rise to unsafe levels, protecting both the battery cells and your power tool from heat-related damage.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is included in the package?\u003c\/h4\u003e\n\u003cp\u003eA: The package includes one (1) Makita 21V Battery Protection Replacement BMS Board, individually bagged. No battery or charger is included.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Is this Makita 21V BMS replacement board compatible with all Makita battery models?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This board is designed for Makita 21V 5-cell (5S) lithium-ion battery packs. 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