{"product_id":"3s-50a-21v-lithium-battery-bms-board-mt5s-power-tools-ebikes","title":"3S 50A 21V Lithium BMS Board MT5S for Power Tools \u0026 E-Bikes","description":"\n\u003ch2\u003e3-Series 50A 21V Lithium Battery BMS Protection Board – MT5S Module\u003c\/h2\u003e\n\u003cp\u003eUpgrade your battery pack with this compact yet powerful \u003cstrong\u003e3-Series (3S) 50A 21V Lithium Battery BMS Board (MT5S Module)\u003c\/strong\u003e. Engineered for demanding applications including power tools, electric bikes, and DIY battery pack builds, this PCB protection board delivers reliable charge\/discharge management with multi-layer safety features built right in. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Protection Circuit:\u003c\/strong\u003e High-precision protection against overcharge, over-discharge, and short circuits — keeping your battery pack and equipment safe at all times.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e50A Instant Start Current:\u003c\/strong\u003e Handles up to 50A instantaneous output, delivering robust performance for high-power tools and equipment.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBalanced Charge\/Discharge:\u003c\/strong\u003e Built-in cell balancing ensures all cells charge and discharge evenly, extending overall battery pack lifespan.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Designed for 3S lithium battery configurations (21V fully charged); ideal for angle grinders, wrenches, e-bikes, and a wide range of power tools.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExcellent Heat Dissipation:\u003c\/strong\u003e High-quality PCB material and alloy construction provide superior thermal management for long-term, stable operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Size:\u003c\/strong\u003e Measures just 46 × 40 mm (approx. 1.81 × 1.57 in), making it easy to fit into custom battery housings and enclosures.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModule Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMT5S BMS Protection Board\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSeries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3S (3-Series)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e21V (fully charged)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Continuous Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e50A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePCB \/ Alloy\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e46 × 40 mm \/ 1.81 × 1.57 in\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo\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 Includes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 3S 50A 21V BMS Protection Board (MT5S Module)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003ePhotos are for reference only; please refer to specifications for exact dimensions.\u003c\/li\u003e\n  \u003cli\u003eAllow slight variation due to manual measurement.\u003c\/li\u003e\n  \u003cli\u003eScreen calibration may cause minor color differences from the actual product.\u003c\/li\u003e\n  \u003cli\u003eBatteries are \u003cstrong\u003enot included\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\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 for O-Rings \u0026amp; Tubes\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-multi-use-faucet-bubbler-wrenches-6-sizes-sink-wrenches-detach-tool-for-kitchen-bathroom-faucet-parts-repair-spanner\"\u003e1PC Multi-Use Faucet Bubbler Wrenches – 6 Sizes Repair Spanner\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 Caulking Tools\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.energystar.gov\/products\" target=\"_blank\" rel=\"noopener\"\u003eENERGY STAR product efficiency guidance\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What battery configuration is this BMS board designed for?\u003c\/h4\u003e\n\u003cp\u003eA: This BMS board is designed for \u003cstrong\u003e3-Series (3S) lithium battery packs\u003c\/strong\u003e, which have a fully charged voltage of 21V. It is compatible with standard 18650 and similar 3S lithium cell configurations commonly used in power tools and e-bikes.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this board support cell balancing?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, the MT5S module features \u003cstrong\u003ebuilt-in cell balancing\u003c\/strong\u003e during charging, ensuring all cells in your 3S pack charge evenly to maximize capacity and extend battery life.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this BMS board suitable for e-bikes?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. With a \u003cstrong\u003e50A instant current rating\u003c\/strong\u003e and multi-protection features, this board is well-suited for e-bike battery packs, angle grinders, cordless wrenches, and other high-power applications.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Are batteries included with this purchase?\u003c\/h4\u003e\n\u003cp\u003eA: No, batteries are \u003cstrong\u003enot included\u003c\/strong\u003e. This listing is for the BMS protection board only. You will need to source your own 3S lithium cells separately.\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 battery configuration is this BMS board designed for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This BMS board is designed for 3-Series (3S) lithium battery packs, which have a fully charged voltage of 21V. It is compatible with standard 18650 and similar 3S lithium cell configurations commonly used in power tools and e-bikes.\"}}, {\"@type\": \"Question\", \"name\": \"Does this board support cell balancing?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, the MT5S module features built-in cell balancing during charging, ensuring all cells in your 3S pack charge evenly to maximize capacity and extend battery life.\"}}, {\"@type\": \"Question\", \"name\": \"Is this BMS board suitable for e-bikes?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Absolutely. With a 50A instant current rating and multi-protection features, this board is well-suited for e-bike battery packs, angle grinders, cordless wrenches, and other high-power applications.\"}}, {\"@type\": \"Question\", \"name\": \"Are batteries included with this purchase?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No, batteries are not included. This listing is for the BMS protection board only. You will need to source your own 3S lithium cells 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:\/\/x1davz-b4.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home page\", \"item\": \"https:\/\/x1davz-b4.myshopify.com\/collections\/frontpage\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"3S 50A 21V Lithium BMS Board MT5S for Power Tools \u0026 E-Bikes\", \"item\": \"https:\/\/x1davz-b4.myshopify.com\/products\/3s-50a-21v-lithium-battery-bms-board-mt5s-power-tools-ebikes\"}]}\u003c\/script\u003e","brand":"Nixie","offers":[{"title":"Default Title","offer_id":67609054511203,"sku":"1005012193350903-Default Title","price":6.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/2047\/6003\/files\/S948862eb73a24c079636ecf7b883eed0P.webp?v=1790786985","url":"https:\/\/nixiehaven.com\/products\/3s-50a-21v-lithium-battery-bms-board-mt5s-power-tools-ebikes","provider":"Nixie","version":"1.0","type":"link"}