{"product_id":"21v-li-ion-bms-battery-protection-circuit-board-3mos","title":"21V Li-Ion BMS Battery Protection Circuit Board 3MOS PCB","description":"\n\u003ch2\u003e21V Li-Ion BMS Battery Protection Circuit Board – 3MOS\u003c\/h2\u003e\n\u003cp\u003eKeep your lithium-ion battery packs running safely and efficiently with this durable \u003cstrong\u003e21V BMS (Battery Management System) Protection Circuit Board\u003c\/strong\u003e. Designed with 3 MOS transistors, this compact PCB module delivers comprehensive multi-layer protection for your power tool battery packs, electric scooters, e-bikes, and more — all in a rugged, reusable metal construction built to handle vibration and demanding use.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Mode Protection:\u003c\/strong\u003e Built-in overvoltage, undervoltage, overcurrent, overcharge, and overheat protection safeguards every cell in the pack.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3 MOS Design:\u003c\/strong\u003e Three MOSFET transistors ensure stable, reliable switching and efficient current handling during charge and discharge cycles.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Suitable for 21V Li-ion battery packs used in power tools (torque wrenches, impact drills, angle grinders), electric scooters, e-bikes, electric motorcycles, electric tricycles, and other electric appliances.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStable \u0026amp; Anti-Vibration:\u003c\/strong\u003e Solid metal construction minimizes the effects of vibration, making it ideal for high-torque power tool applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReusable:\u003c\/strong\u003e Designed for long-term use — replace, repair, or upgrade your existing battery pack's protection module without replacing the whole battery.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e BMS PCB Battery Protection Board\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e 3MOS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Voltage:\u003c\/strong\u003e 21V Li-Ion Battery Packs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\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\u003eReusability:\u003c\/strong\u003e Reusable\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Contents:\u003c\/strong\u003e 1 × PCB Protection Circuit Board\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatible Applications\u003c\/h3\u003e\n\u003cp\u003eThis BMS module is the ideal replacement or upgrade protection board for:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e21V power tools (drills, impact drivers, angle grinders, torque wrenches)\u003c\/li\u003e\n  \u003cli\u003eElectric scooters \u0026amp; e-bikes\u003c\/li\u003e\n  \u003cli\u003eElectric motorcycles \u0026amp; tricycles\u003c\/li\u003e\n  \u003cli\u003eElectric vehicles \u0026amp; appliances\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Color may vary slightly from images due to monitor brightness and lighting conditions. Please refer to the actual item received.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-2-inch-8-piece-hex-short-socket-set-vanadium-steel\"\u003e1\/2\" Drive 8-Piece Hex Short Socket Set – Vanadium Steel\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/hex-nut-bolt-extractor-tool-kit-10-piece\"\u003e10-Pc Hex Nut \u0026amp; Bolt Extractor Kit 9–19mm | HIP Tools\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/105-degree-right-angle-driver-with-hex-screwdriver-bit\"\u003e105° Right Angle Driver with 1\/4\" Hex Screwdriver Bit | HIP\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.epa.gov\/recycle\/used-lithium-ion-batteries\" target=\"_blank\" rel=\"noopener\"\u003eEPA guidance on lithium-ion battery handling\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does a BMS protection circuit board do for a lithium battery pack?\u003c\/h4\u003e\n\u003cp\u003eA: A BMS (Battery Management System) protection circuit board monitors and manages each cell in a lithium-ion battery pack. This 21V 3MOS board provides overvoltage, undervoltage, overcurrent, overcharge, and overheat protection — helping to extend battery life, maintain stable performance, and keep your devices operating safely.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this BMS board compatible with my power tool battery?\u003c\/h4\u003e\n\u003cp\u003eA: This board is designed for 21V Li-ion battery packs and is compatible with a wide range of power tools including impact drills, torque wrenches, and angle grinders. It is also suitable for electric scooters, e-bikes, and similar electric vehicles. Always verify your pack's voltage and cell configuration before installation.\u003c\/p\u003e\n\u003ch4\u003eQ: Does this product come with a battery or charger?\u003c\/h4\u003e\n\u003cp\u003eA: No — this package includes only 1 × BMS PCB Protection Circuit Board. No battery or charger is included. It is intended as a replacement or repair component for existing 21V Li-ion battery packs.\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 does a BMS protection circuit board do for a lithium battery pack?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A BMS (Battery Management System) protection circuit board monitors and manages each cell in a lithium-ion battery pack. This 21V 3MOS board provides overvoltage, undervoltage, overcurrent, overcharge, and overheat protection — helping to extend battery life, maintain stable performance, and keep your devices operating safely.\"}}, {\"@type\": \"Question\", \"name\": \"Is this BMS board compatible with my power tool battery?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This board is designed for 21V Li-ion battery packs and is compatible with a wide range of power tools including impact drills, torque wrenches, and angle grinders. It is also suitable for electric scooters, e-bikes, and similar electric vehicles. Always verify your pack's voltage and cell configuration before installation.\"}}, {\"@type\": \"Question\", \"name\": \"Does this product come with a battery or charger?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — this package includes only 1 × BMS PCB Protection Circuit Board. No battery or charger is included. It is intended as a replacement or repair component for existing 21V Li-ion battery packs.\"}}]}\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:\/\/rw8eae-v1.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Tools \u0026 Household\", \"item\": \"https:\/\/rw8eae-v1.myshopify.com\/collections\/tools-household\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"21V Li-Ion BMS Battery Protection Circuit Board 3MOS PCB\", \"item\": \"https:\/\/rw8eae-v1.myshopify.com\/products\/21v-li-ion-bms-battery-protection-circuit-board-3mos\"}]}\u003c\/script\u003e","brand":"HIP","offers":[{"title":"Onesize","offer_id":46320540975338,"sku":"1005012871390493-Onesize","price":13.38,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0718\/4590\/4618\/files\/Se04d9b4263c94cd0a07032b50595c9b5B_6486cfff-151e-40b6-8490-b072ef94514c.webp?v=1790194878","url":"https:\/\/hipcustomerservice.com\/products\/21v-li-ion-bms-battery-protection-circuit-board-3mos","provider":"HIP","version":"1.0","type":"link"}