{"product_id":"3s-18650-lithium-battery-bms-protection-board-12-6v-15a","title":"3S 18650 Lithium Battery BMS Protection Board 12.6V 15A","description":"\n\u003ch2\u003e3-Series 18650 Lithium Battery Protection Board (BMS) – 12.6V, 15A\u003c\/h2\u003e\n\u003cp\u003eKeep your 3-series 11.1V\/12V lithium battery packs running safely and efficiently with this compact Battery Management System (BMS) protection board. Designed for 18650 lithium cell configurations, this board provides reliable overcharge, over-discharge, and overcurrent protection along with active cell balancing — all in a small SMD package that fits neatly into DIY battery builds, alarm systems, and electronics projects.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3S Configuration:\u003c\/strong\u003e Supports three 18650 lithium cells in series (11.1V nominal \/ 12.6V fully charged)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e15A Continuous Discharge Current:\u003c\/strong\u003e Handles demanding loads with stable current delivery\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOvercharge Protection:\u003c\/strong\u003e Automatically cuts off charging when cells reach full capacity (4.2V per cell), extending battery life\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOver-Discharge Protection:\u003c\/strong\u003e Prevents cells from draining below safe voltage thresholds, preserving cell health\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOvercurrent \u0026amp; Short-Circuit Protection:\u003c\/strong\u003e Instantly disconnects on abnormal current spikes to keep your project and cells safe\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCell Balancing:\u003c\/strong\u003e Actively equalises voltage across all three cells for uniform charge distribution and a longer overall pack lifespan\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact SMD Package:\u003c\/strong\u003e Easy to integrate into tight battery enclosures and custom builds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Brand new\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConfiguration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3 Series (3S)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e11.1V \/ 12V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Charge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12.6V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eContinuous Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15A\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSMD\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eQuantity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 piece\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 China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWho Is This For?\u003c\/h3\u003e\n\u003cp\u003eThis protection board is ideal for hobbyists, electronics engineers, and makers building or repairing 3S lithium battery packs for alarm systems, power tools, portable electronics, RC vehicles, DIY power banks, and other 12V applications.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\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 does a 3S BMS protection board do for my 18650 lithium battery pack?\u003c\/h4\u003e\n\u003cp\u003eA: A 3S BMS (Battery Management System) protection board monitors and controls your three-cell series lithium pack. It prevents overcharging (above 4.2V per cell), over-discharging (below safe cutoff voltage), overcurrent, and short circuits. The built-in balancing function also keeps all three cells at equal voltage levels, maximising pack capacity and longevity.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this board compatible with standard 18650 lithium cells?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. This protection board is specifically designed for 3-series (3S) 18650 lithium-ion cells with a nominal voltage of 11.1V\/12V and a full-charge voltage of 12.6V. It supports up to 15A continuous discharge current, making it suitable for most common 3S pack applications.\u003c\/p\u003e\n\u003ch4\u003eQ: How do I wire this protection board into my battery pack?\u003c\/h4\u003e\n\u003cp\u003eA: The board has clearly labelled connection points for B- (battery negative), B+ (battery positive), and the balance taps for each cell. Connect each cell's positive terminal to the corresponding balance tap, link the pack's main positive and negative terminals to B+ and B-, and connect your load\/charger to the output terminals (P- and P+). Always follow the board's wiring diagram for safe installation.\u003c\/p\u003e\n\u003ch4\u003eQ: Can this BMS board be used in alarm systems?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The board is listed with alarm system compatibility. Its stable 12V output and built-in protection features make it well-suited for powering alarm system battery backups and similar low-to-medium current 12V applications.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does a 3S BMS protection board do for my 18650 lithium battery pack?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A 3S BMS (Battery Management System) protection board monitors and controls your three-cell series lithium pack. It prevents overcharging (above 4.2V per cell), over-discharging (below safe cutoff voltage), overcurrent, and short circuits. 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Its stable 12V output and built-in protection features make it well-suited for powering alarm system battery backups and similar low-to-medium current 12V applications.\"}}]}\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:\/\/n8ande-60.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home page\", \"item\": \"https:\/\/n8ande-60.myshopify.com\/collections\/frontpage\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"3S 18650 Lithium Battery BMS Protection Board 12.6V 15A\", \"item\": \"https:\/\/n8ande-60.myshopify.com\/products\/3s-18650-lithium-battery-bms-protection-board-12-6v-15a\"}]}\u003c\/script\u003e","brand":"Axl","offers":[{"title":"Default Title","offer_id":43692907036733,"sku":"\u003cnone\u003e","price":12.09,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0671\/3439\/0333\/files\/S350832cf37994dc7af0385c4d9d99ca0Y.webp?v=1790180365","url":"https:\/\/qtiply.com\/products\/3s-18650-lithium-battery-bms-protection-board-12-6v-15a","provider":"QTP","version":"1.0","type":"link"}