{"product_id":"makita-21v-5s-bms-protection-board-5mos3-balanced-temperature-control","title":"Makita 21V 5S BMS Protection Board – 5Mos3 Balanced \u0026 Temp Control","description":"\n\u003ch2\u003eMakita 21V 5-Cell Battery Protection Board with Balanced Charging \u0026amp; Temperature Control\u003c\/h2\u003e\n\u003cp\u003eKeep your Makita 21V battery pack running safely and efficiently with this purpose-built \u003cstrong\u003e5-string (5S) Battery Management System (BMS) protection board\u003c\/strong\u003e. Featuring a \u003cstrong\u003e5Mos3 alloy MOSFET configuration\u003c\/strong\u003e, this board delivers reliable balanced cell protection, over-charge and over-discharge cutoff, short-circuit protection, and integrated temperature control — all in a compact, lightweight 30g bagged unit.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're rebuilding a worn-out Makita battery pack or upgrading an existing one, this protection board is a cost-effective solution that helps extend the life of your cells and safeguard your tools.\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 5-string (5S) battery configurations\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMOSFET Type:\u003c\/strong\u003e 5Mos3 alloy for reliable switching performance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBalanced Cell Protection:\u003c\/strong\u003e Keeps all 5 cells balanced for maximum capacity and lifespan\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Control:\u003c\/strong\u003e Built-in thermal management helps prevent overheating\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOver-charge \/ Over-discharge Protection:\u003c\/strong\u003e Automatic cutoff to protect your cells\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShort-Circuit Protection:\u003c\/strong\u003e Instant response to prevent damage\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCE Certified:\u003c\/strong\u003e Meets European safety and quality standards\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLightweight:\u003c\/strong\u003e Only 30g per unit\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePacking:\u003c\/strong\u003e Individually bagged for safe shipping and storage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e21V (5S Li-ion)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMOSFET\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5Mos3 Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30g\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCertification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCE\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharger Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Makita 21V 5-String 5Mos3 BMS Balanced Protection Board\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\/1-channel-scr-solid-state-relay-switch-module-dc3-24v-40a-optocoupler\"\u003e1-Channel SCR Solid State Relay Module DC3-24V 40A Optocoupler\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-60mpa-pressure-gauge-s60h-diesel-injector-nozzle-tester-8000psi\"\u003e0-60MPa Pressure Gauge for S60H Diesel Injector Nozzle Tester\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on battery safety and best practices for lithium-ion battery use, visit the U.S. Consumer Product Safety Commission – Lithium-Ion Battery Safety.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Battery_management_system\" target=\"_blank\" rel=\"noopener\"\u003eBattery management system\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What battery packs is this Makita 21V BMS protection board compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This protection board is specifically designed for Makita 21V 5-string (5S) lithium-ion battery packs using the 5Mos3 alloy MOSFET configuration. Always verify your cell count and voltage before installing to ensure compatibility.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does the board include balanced charging protection for all 5 cells?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The board includes a built-in cell balancing function that actively keeps all 5 cells at equal charge levels during charging and discharging, which significantly extends overall battery lifespan and maintains consistent performance.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is a battery or charger included with this BMS board?\u003c\/h4\u003e\n\u003cp\u003eA: No — this listing is for the protection board only. No battery cells or charger are included. It is intended as a replacement or upgrade component for DIY battery pack repairs or rebuilds.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What does the temperature control feature do?\u003c\/h4\u003e\n\u003cp\u003eA: The integrated temperature control monitors the heat generated by the battery cells and MOSFET components during operation. If temperatures rise to unsafe levels, the board can automatically cut power to prevent overheating, cell damage, or potential safety hazards.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What battery packs is this Makita 21V BMS protection board compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This protection board is specifically designed for Makita 21V 5-string (5S) lithium-ion battery packs using the 5Mos3 alloy MOSFET configuration. 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If temperatures rise to unsafe levels, the board can automatically cut power to prevent overheating, cell damage, or potential safety hazards.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/oasis-select.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Electronics \u0026 Tech\", \"item\": \"https:\/\/oasis-select.com\/collections\/electronics-tech\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"Makita 21V 5S BMS Protection Board – 5Mos3 Balanced \u0026 Temp Control\", \"item\": \"https:\/\/oasis-select.com\/products\/makita-21v-5s-bms-protection-board-5mos3-balanced-temperature-control\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"1","offer_id":47723840929897,"sku":"14:771#1","price":12.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/S1aa4e44df3b0424983e5c6890c7779bdL.webp?v=1782404661","url":"https:\/\/oasis-select.com\/products\/makita-21v-5s-bms-protection-board-5mos3-balanced-temperature-control","provider":"Oasis Select","version":"1.0","type":"link"}