{"product_id":"makita-21v-lithium-ion-battery-pcb-circuit-board-balanced-protection-temperature-control","title":"Makita 21V Li-Ion Battery PCB Board | Balanced Protection \u0026 Temp Control","description":"\u003ch2\u003eMakita 21V Lithium-Ion Battery PCB Circuit Board with Balanced Protection\u003c\/h2\u003e\n\u003cp\u003eKeep your Makita power tools running at peak performance with this precision-engineered \u003cstrong\u003e21V Lithium-Ion Battery PCB Circuit Board\u003c\/strong\u003e. Featuring a 5-string balanced protection design with 5 MOSFETs, 3-alloy construction, and built-in temperature control, this circuit board is the ideal replacement or spare part for Makita-compatible battery packs. Whether you're rebuilding a worn battery or replacing a faulty board, this drop-in solution restores full function quickly and affordably.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBalanced Cell Protection:\u003c\/strong\u003e 5-string balanced protection plate ensures even charge distribution across all cells, maximizing battery lifespan and efficiency.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5 MOSFET Design:\u003c\/strong\u003e High-quality 5-MOS configuration delivers stable current flow and improved load handling for demanding power tool applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3-Alloy Construction:\u003c\/strong\u003e Durable alloy components provide robust electrical conductivity and long-term reliability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Control:\u003c\/strong\u003e Integrated thermal management circuitry monitors and regulates temperature, helping to prevent overheating during charge and discharge cycles.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e21V Compatibility:\u003c\/strong\u003e Designed to work with Makita-compatible 21V lithium-ion battery packs (5-cell series configuration).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLightweight \u0026amp; Compact:\u003c\/strong\u003e Single set weighs just 30g — easy to install without adding bulk to your battery pack.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConvenient Packaging:\u003c\/strong\u003e Arrives in a protective bag to keep the board safe during shipping and storage.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 21V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e 5-string with balanced protection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMOSFETs:\u003c\/strong\u003e 5 MOS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 3-Alloy\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Control:\u003c\/strong\u003e Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 30g per set\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Bagged\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\u003eCountry of Origin:\u003c\/strong\u003e Made in China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 21V Lithium-Ion Battery PCB Circuit Board (with balanced protection \u0026amp; temperature control)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePerfect For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDIY battery pack rebuilds and repairs\u003c\/li\u003e\n  \u003cli\u003eElectronics hobbyists and power tool enthusiasts\u003c\/li\u003e\n  \u003cli\u003eWorkshop technicians servicing Makita-compatible battery packs\u003c\/li\u003e\n  \u003cli\u003eReplacing damaged or faulty BMS boards in 5S Li-Ion configurations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor best practices around lithium-ion battery safety, refer to the U.S. Consumer Product Safety Commission – Lithium-Ion Battery Safety Information.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino\"\u003e1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino\u003c\/a\u003e\u003c\/li\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\/0-25mm-1000-turn-precision-copper-inductor-coil-diy-electronics\"\u003e0.25mm 1000-Turn Precision Copper Inductor Coil for DIY Circuits\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Printed_circuit_board\" target=\"_blank\" rel=\"noopener\"\u003ePrinted circuit board\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Is this PCB circuit board compatible with all Makita 21V battery packs?\u003c\/h4\u003e\n\u003cp\u003eA: This board is designed for Makita-compatible 21V lithium-ion battery packs using a 5-string (5S) cell configuration. We recommend verifying your battery pack's cell count and voltage rating before purchasing to ensure compatibility.\u003c\/p\u003e\n\u003ch4\u003eQ: Does this board include built-in temperature control?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The integrated temperature control circuitry actively monitors heat levels during both charging and discharging, helping to maintain safe operating conditions and extend the overall life of your battery cells.\u003c\/p\u003e\n\u003ch4\u003eQ: Do I need any special tools to install this PCB circuit board?\u003c\/h4\u003e\n\u003cp\u003eA: Basic electronics tools such as a soldering iron, solder, and wire strippers are typically required for installation. It is recommended that the installation be performed by someone with experience in battery electronics or PCB soldering to ensure a safe and reliable connection.\u003c\/p\u003e\n\u003ch4\u003eQ: Is a battery or charger included with this purchase?\u003c\/h4\u003e\n\u003cp\u003eA: No — this listing is for the PCB circuit board only. Battery cells and chargers are sold separately.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Is this PCB circuit board compatible with all Makita 21V battery packs?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This board is designed for Makita-compatible 21V lithium-ion battery packs using a 5-string (5S) cell configuration. We recommend verifying your battery pack's cell count and voltage rating before purchasing to ensure compatibility.\"}}, {\"@type\": \"Question\", \"name\": \"Does this board include built-in temperature control?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! The integrated temperature control circuitry actively monitors heat levels during both charging and discharging, helping to maintain safe operating conditions and extend the overall life of your battery cells.\"}}, {\"@type\": \"Question\", \"name\": \"Do I need any special tools to install this PCB circuit board?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Basic electronics tools such as a soldering iron, solder, and wire strippers are typically required for installation. 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Battery cells and chargers are sold separately.\"}}]}\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 Li-Ion Battery PCB Board | Balanced Protection \u0026 Temp Control\", \"item\": \"https:\/\/oasis-select.com\/products\/makita-21v-lithium-ion-battery-pcb-circuit-board-balanced-protection-temperature-control\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"A","offer_id":47748991909993,"sku":"14:10#A","price":15.51,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/Seb8ae26b6b594c7da883ba58e7ae6325E.webp?v=1783091051","url":"https:\/\/oasis-select.com\/products\/makita-21v-lithium-ion-battery-pcb-circuit-board-balanced-protection-temperature-control","provider":"Oasis Select","version":"1.0","type":"link"}