{"product_id":"21v-18650-battery-protection-board-temperature-control-side-lights","title":"21V 18650 Battery Protection Board with Temperature Control","description":"\n\u003ch2\u003e21V 18650 Battery Protection Board with Temperature Control \u0026amp; Side Lights\u003c\/h2\u003e\n\u003cp\u003eKeep your cordless power tools running safely and efficiently with this 6MOS 3-Alloy 21V Protection Board for 18650 lithium battery packs. Designed with built-in temperature control circuitry and side indicator lights, this compact board delivers reliable overcharge, over-discharge, and short-circuit protection for a wide range of power 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 MOSFETs with a triple-alloy layout for balanced current distribution and improved thermal performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Control:\u003c\/strong\u003e Integrated thermal sensing helps prevent overheating during heavy-duty tool operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSide Indicator Lights:\u003c\/strong\u003e Built-in LED side lights provide a clear visual status of battery charge and board activity.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e21V Rated Voltage:\u003c\/strong\u003e Compatible with standard 5-cell 18650 lithium battery packs used in most 21V cordless tools.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComprehensive Protection:\u003c\/strong\u003e Guards against overcharge, over-discharge, overcurrent, and short circuit to extend battery pack life.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Made from metal components for lasting durability in demanding workshop environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cp\u003eSuitable for use with a wide variety of cordless power tools including:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eAngle Grinders\u003c\/li\u003e\n  \u003cli\u003eElectric Scissors\u003c\/li\u003e\n  \u003cli\u003eElectric Hammers\u003c\/li\u003e\n  \u003cli\u003eElectric Saws\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\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Compatibility:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e18650 Lithium Cells\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMOSFET Configuration:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6MOS 3-Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial:\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMetal\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\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 21V 18650 Battery Protection Board\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003ePlease Note:\u003c\/strong\u003e Colors may vary slightly from product images due to monitor brightness and lighting conditions. Please refer to the actual product received.\u003c\/p\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/50pcs-nickel-sheets-18650-lithium-battery-spot-welding\"\u003e50Pcs Nickel Sheets for 18650 Battery Spot Welding Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/3-jaw-keyless-ratchet-drill-chuck-0-8-10mm-self-locking\"\u003e3-Jaw Keyless Ratchet Drill Chuck 0.8–10mm Self-Locking\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/pu-leather-welding-sleeves-heat-resistant-arm-guards\"\u003ePU Leather Welding Sleeves – Heat Resistant Arm Guards 1 Pair\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What tools is this 21V 18650 protection board compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This protection board is designed for 21V cordless power tools that use 18650 lithium battery packs, including angle grinders, electric scissors, electric hammers, and electric saws. It is ideal as a replacement or upgrade board for DIY and professional tool battery packs.\u003c\/p\u003e\n\u003ch4\u003eQ: What does the temperature control feature do on this battery protection board?\u003c\/h4\u003e\n\u003cp\u003eA: The integrated temperature control circuit monitors the heat generated during tool operation and charging. If the board detects that temperatures are rising beyond a safe threshold, it acts to limit current flow, helping to protect both the battery cells and the tool from thermal damage.\u003c\/p\u003e\n\u003ch4\u003eQ: What does \"6MOS 3-Alloy\" mean on this protection board?\u003c\/h4\u003e\n\u003cp\u003eA: \"6MOS\" refers to the six MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) switches on the board, which handle the switching of charge and discharge current. \"3-Alloy\" describes the three-alloy configuration that helps distribute current evenly across the MOSFETs for improved efficiency and heat management.\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 tools is this 21V 18650 protection board compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This protection board is designed for 21V cordless power tools that use 18650 lithium battery packs, including angle grinders, electric scissors, electric hammers, and electric saws. 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