{"product_id":"21v-18650-battery-protection-board-makita-6mos-30a-5mos-25a","title":"21V 18650 Battery Protection Board for Makita – 6MOS 30A \/ 5MOS 25A","description":"\n\u003ch2\u003e21V 18650 Battery Protection Circuit Board – Compatible with Makita Power Tools\u003c\/h2\u003e\n\u003cp\u003eKeep your Makita 18V\/21V lithium-ion battery packs running safely and reliably with this high-quality \u003cstrong\u003eBattery Management System (BMS) Protection Board\u003c\/strong\u003e. Available in two configurations — \u003cstrong\u003e6MOS 30A\u003c\/strong\u003e and \u003cstrong\u003e5MOS 25A\u003c\/strong\u003e — this 5-string (5S) protection board is engineered to guard your 18650 cells against overcharge, over-discharge, short circuit, and overcurrent, dramatically extending the life of your battery pack.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're rebuilding a worn-out Makita battery or upgrading an existing pack, this CE-certified replacement circuit board is a cost-effective and dependable solution for DIY enthusiasts, technicians, and tradespeople alike.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible with Makita 18V\/21V 18650 battery packs\u003c\/strong\u003e — drop-in replacement for standard 5-string configurations\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTwo variants available:\u003c\/strong\u003e 6MOS 30A (higher current capacity) and 5MOS 25A (standard performance)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3 alloy MOSFETs\u003c\/strong\u003e for efficient switching and low heat generation\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in temperature control\u003c\/strong\u003e — thermal protection prevents overheating during charge and discharge cycles\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCopper hardware contacts\u003c\/strong\u003e for superior conductivity and durability\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLarge board design (5-string\/5S)\u003c\/strong\u003e — accommodates standard 18650 cell layouts\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCE Certified\u003c\/strong\u003e — meets European safety and electromagnetic compatibility standards\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFull protection suite:\u003c\/strong\u003e overcharge, over-discharge, overcurrent, and short-circuit protection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow voltage rating:\u003c\/strong\u003e below 75V DC \/ 50V AC — safe for residential and workshop use\u003c\/li\u003e\n  \u003cli\u003eMade in Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;\"\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eConfiguration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e5-String (5S) — 21V nominal\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eVariants\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e6MOS 30A \/ 5MOS 25A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eCell Compatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e18650 Lithium-Ion\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eVoltage Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003eBelow 75V DC \/ 50V AC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eCertification\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003eCE\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e1 × Protection Board\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003e\u003cstrong\u003eBattery \/ Charger Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px;border:1px solid #ddd;\"\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhy Replace Your Battery Protection Board?\u003c\/h3\u003e\n\u003cp\u003eA faulty BMS is one of the most common reasons a lithium-ion battery pack stops charging or loses capacity. Instead of buying an entirely new battery, replacing just the protection circuit board is a smart, affordable fix. For more information on lithium-ion battery safety, refer to the U.S. Consumer Product Safety Commission's Lithium-Ion Battery Safety Guide.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/hex-shank-wire-twister-drill-attachment-rebar-tie-tool\"\u003e1\/4\" Hex Shank Wire Twister Drill Attachment | Rebar Tie Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/14-in-1-electrician-pliers-wire-stripper-cable-cutter-voltage-tester\"\u003e14-in-1 Electrician Pliers – Wire Stripper, Cutter \u0026amp; Tester\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/wall-mounted-14-hole-screwdriver-tool-organizer-rack\"\u003e14-Hole Wall-Mounted Screwdriver \u0026amp; Tool Organizer Rack\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Which Makita battery packs is this protection board compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This 21V 5-string (5S) 18650 BMS protection board is designed for Makita 18V\/21V lithium-ion battery packs that use standard 18650 cells in a 5S configuration. Always verify your existing board's dimensions and cell layout before purchasing to ensure a proper fit.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the difference between the 6MOS 30A and 5MOS 25A variants?\u003c\/h4\u003e\n\u003cp\u003eA: The \u003cstrong\u003e6MOS 30A\u003c\/strong\u003e version uses six MOSFET transistors and supports a continuous discharge current of up to 30A, making it suitable for higher-demand power tools. The \u003cstrong\u003e5MOS 25A\u003c\/strong\u003e version uses five MOSFETs and handles up to 25A — ideal for standard Makita tool usage. Choose based on your tool's current draw requirements.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this board protect against overcharging and short circuits?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. This BMS protection board includes full overcharge protection, over-discharge protection, overcurrent protection, and short-circuit protection, as well as a built-in temperature control function to prevent thermal runaway — a key safety feature for 18650 lithium-ion cells.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is installation difficult? Do I need special tools?\u003c\/h4\u003e\n\u003cp\u003eA: Installation requires basic soldering skills and appropriate tools (soldering iron, multimeter). It is recommended for experienced DIYers or electronics technicians. If you are not comfortable working with lithium-ion cells, please seek professional assistance, as improper handling can be hazardous.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does the package include batteries or a charger?\u003c\/h4\u003e\n\u003cp\u003eA: No. The package includes \u003cstrong\u003e1 × Protection Board only\u003c\/strong\u003e. Batteries and chargers are sold separately.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Which Makita battery packs is this protection board compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This 21V 5-string (5S) 18650 BMS protection board is designed for Makita 18V\/21V lithium-ion battery packs that use standard 18650 cells in a 5S configuration. Always verify your existing board's dimensions and cell layout before purchasing to ensure a proper fit.\"}}, {\"@type\": \"Question\", \"name\": \"What is the difference between the 6MOS 30A and 5MOS 25A variants?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The 6MOS 30A version uses six MOSFET transistors and supports a continuous discharge current of up to 30A, making it suitable for higher-demand power tools. The 5MOS 25A version uses five MOSFETs and handles up to 25A — ideal for standard Makita tool usage. Choose based on your tool's current draw requirements.\"}}, {\"@type\": \"Question\", \"name\": \"Does this board protect against overcharging and short circuits?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. This BMS protection board includes full overcharge protection, over-discharge protection, overcurrent protection, and short-circuit protection, as well as a built-in temperature control function to prevent thermal runaway — a key safety feature for 18650 lithium-ion cells.\"}}, {\"@type\": \"Question\", \"name\": \"Is installation difficult? Do I need special tools?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Installation requires basic soldering skills and appropriate tools (soldering iron, multimeter). It is recommended for experienced DIYers or electronics technicians. If you are not comfortable working with lithium-ion cells, please seek professional assistance, as improper handling can be hazardous.\"}}, {\"@type\": \"Question\", \"name\": \"Does the package include batteries or a charger?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. The package includes 1 × Protection Board only. Batteries 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:\/\/0i45ne-c8.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Parts \u0026 Repair Tools\", \"item\": \"https:\/\/0i45ne-c8.myshopify.com\/collections\/parts-repair-tools\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"21V 18650 Battery Protection Board for Makita – 6MOS 30A \/ 5MOS 25A\", \"item\": \"https:\/\/0i45ne-c8.myshopify.com\/products\/21v-18650-battery-protection-board-makita-6mos-30a-5mos-25a\"}]}\u003c\/script\u003e","brand":"Zpaxo","offers":[{"title":"5MOS 25A","offer_id":54156562235702,"sku":"14:365458#5MOS 25A","price":14.24,"currency_code":"USD","in_stock":true},{"title":"6MOS 30A","offer_id":54156562268470,"sku":"14:200004890#6MOS 30A","price":14.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0989\/7774\/3158\/files\/S879a663299ad4adea620accb93cf2522G.webp?v=1782452263","url":"https:\/\/0i45ne-c8.myshopify.com\/products\/21v-18650-battery-protection-board-makita-6mos-30a-5mos-25a","provider":"Zpaxo","version":"1.0","type":"link"}