{"product_id":"21v-18650-bms-protection-board-temperature-monitor-power-tools","title":"21V 18650 BMS Protection Board with Temp Monitor for Power Tools","description":"\n\u003ch2\u003e21V 18650 BMS Protection Circuit Board with Temperature Monitor\u003c\/h2\u003e\n\u003cp\u003eKeep your cordless power tools running safely and efficiently with this \u003cstrong\u003e6MOS 21V 18650 Battery Management System (BMS) Protection Board\u003c\/strong\u003e. Designed for high-demand power tools, this circuit board features built-in temperature monitoring to help prevent overheating, overcharging, and over-discharging — extending the life of your battery pack and your tools.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e6MOS 3-Alloy Design:\u003c\/strong\u003e Six MOSFET configuration delivers stable, efficient power management for 21V lithium battery packs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Control:\u003c\/strong\u003e Integrated temperature monitoring helps safeguard your battery and tool from thermal issues during heavy use.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSide LED Indicator Lamps:\u003c\/strong\u003e Built-in side lights provide a quick visual reference for power status.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Suitable for electric scissors, electric hammers, electric saws, angle grinders, and other 21V cordless power tools using 18650 cells.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Made from quality metal components for reliable, long-lasting performance in demanding workshop and job-site environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Replacement:\u003c\/strong\u003e Drop-in replacement for worn or faulty protection boards — no complex wiring required.\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\u003eBattery Compatibility:\u003c\/strong\u003e 18650 lithium cells\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMOSFET Configuration:\u003c\/strong\u003e 6MOS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal \/ Plastic housing\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Protection:\u003c\/strong\u003e Yes\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Tools:\u003c\/strong\u003e Electric scissors, electric hammers, electric saws, angle grinders\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Made in Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 21V 18650 BMS Protection Circuit Board\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Product color may appear slightly different from images due to monitor brightness and lighting conditions. Please refer to the actual product received.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-10g-high-grade-silicon-grease-lubricant-o-lubrication-good-odorless-smoothness-for-o-rings-tube-silicone-grease-lubricant\"\u003e1PC 10g High Grade Silicon Grease Lubricant – Great for Tool Maintenance\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-large-capacity-battery-storage-organizer-box-batteries-not-included-vintage-beer-crate-appearance-holds-30-aaa-batteries\"\u003e1PC Large Capacity Battery Storage Organizer Box – Keep Your Batteries Organized\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/3pcs-silicone-sealant-scraper-set-multi-functional-caulking-nozzle-tools-for-tile-floor-joints-grout-finishing-and-renovation\"\u003e3PCS Silicone Sealant Scraper Set – Multi-Functional Tool Accessory\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What power tools is this 21V 18650 BMS protection board compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This 21V BMS protection board is designed for use with a wide range of cordless power tools that use 18650 lithium battery cells, including electric scissors, electric hammers, electric saws, and angle grinders. Always verify your tool's voltage and battery configuration before installing.\u003c\/p\u003e\n\u003ch4\u003eQ: What does the temperature monitor feature do on this BMS protection board?\u003c\/h4\u003e\n\u003cp\u003eA: The integrated temperature monitoring circuit continuously tracks the battery pack's heat levels during operation. If temperatures rise beyond safe thresholds, the protection circuit helps prevent damage to both the battery cells and the power tool, contributing to safer and longer-lasting performance.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this BMS board a direct replacement for a worn-out protection circuit?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. This board is intended as a replacement part for faulty or worn 21V 18650 protection circuits in compatible power tools. We recommend verifying your existing board's specifications — voltage, cell count, and MOSFET configuration — to ensure a proper match before installation.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What power tools is this 21V 18650 BMS protection board compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This 21V BMS protection board is designed for use with a wide range of cordless power tools that use 18650 lithium battery cells, including electric scissors, electric hammers, electric saws, and angle grinders. 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We recommend verifying your existing board's specifications — voltage, cell count, and MOSFET configuration — to ensure a proper match before installation.\"}}]}\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:\/\/x1davz-b4.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home page\", \"item\": \"https:\/\/x1davz-b4.myshopify.com\/collections\/frontpage\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"21V 18650 BMS Protection Board with Temp Monitor for Power Tools\", \"item\": \"https:\/\/x1davz-b4.myshopify.com\/products\/21v-18650-bms-protection-board-temperature-monitor-power-tools\"}]}\u003c\/script\u003e","brand":"Nixie","offers":[{"title":"Default Title","offer_id":67609141870691,"sku":"1005010382529343-Default Title","price":9.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/2047\/6003\/files\/S5793c8526fe0434a8919bf543a982508Y.webp?v=1790787925","url":"https:\/\/nixiehaven.com\/products\/21v-18650-bms-protection-board-temperature-monitor-power-tools","provider":"Nixie","version":"1.0","type":"link"}