{"product_id":"2s-20a-bms-board-7-4v-8-4v-18650-lithium-battery-protection","title":"2S 20A BMS Board 7.4V 8.4V 18650 Lithium Battery Protection","description":"\n\u003ch2\u003e2S 20A BMS Board – 7.4V \/ 8.4V 18650 Lithium Battery Protection Circuit\u003c\/h2\u003e\n\u003cp\u003eKeep your DIY lithium battery packs safe and performing at their best with this \u003cstrong\u003e2S 20A Battery Management System (BMS) protection board\u003c\/strong\u003e. Designed for 2-cell series 18650 lithium packs at 7.4V (nominal) \/ 8.4V (fully charged), this compact board guards against overcharge, over-discharge, and short-circuit conditions — making it an essential component for e-bikes, power tools, RC projects, portable power banks, and more.\u003c\/p\u003e\n\u003cp\u003eAvailable in both \u003cstrong\u003eStandard\u003c\/strong\u003e and \u003cstrong\u003eBalance\u003c\/strong\u003e variants, so you can choose the version that best suits your build requirements. The balance version actively equalises cell voltages for longer pack life and more consistent performance.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2S Configuration:\u003c\/strong\u003e Supports two 18650 lithium cells in series\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e20A Continuous Discharge Current:\u003c\/strong\u003e Handles demanding loads in DIY applications\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Voltage:\u003c\/strong\u003e 7.4V | Charging Voltage: 8.4V – 9.0V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOvercharge Protection:\u003c\/strong\u003e Cuts off charging when cells reach maximum safe voltage\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOver-Discharge Protection:\u003c\/strong\u003e Disconnects load before cells drop to damaging levels\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShort-Circuit \u0026amp; Overcurrent Protection:\u003c\/strong\u003e Instantly cuts power on fault detection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBalance Version Available:\u003c\/strong\u003e Keeps individual cell voltages matched for optimal pack health\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact PCB Design:\u003c\/strong\u003e Easy to integrate into custom battery housings\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible With:\u003c\/strong\u003e 18650, and equivalent 2S lithium-ion cell configurations\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eMade in Mainland China\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCell Configuration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e2S (2 cells in series)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRated Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e20A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal Pack Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e7.4V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharging Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8.4V – 9.0V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Cells\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e18650 Lithium-Ion\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eStandard \/ Balance (select your variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eIdeal For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDIY lithium battery packs and rebuilds\u003c\/li\u003e\n  \u003cli\u003eE-bike and scooter battery management\u003c\/li\u003e\n  \u003cli\u003ePower tool battery replacements\u003c\/li\u003e\n  \u003cli\u003ePortable power banks and UPS systems\u003c\/li\u003e\n  \u003cli\u003eRC vehicles, robots, and electronics projects\u003c\/li\u003e\n  \u003cli\u003eSolar energy storage and off-grid projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You Might Like\u003c\/h3\u003e\n\u003cul\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  \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\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 2S BMS protection board do for my lithium battery pack?\u003c\/h4\u003e\n\u003cp\u003eA: A 2S BMS (Battery Management System) board monitors and protects your two-cell lithium battery pack. It prevents overcharging, over-discharging, and short-circuit events that could damage your cells or create a safety hazard. This makes it a must-have component for any DIY 18650 lithium battery project operating at 7.4V \/ 8.4V.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the difference between the Standard and Balance versions?\u003c\/h4\u003e\n\u003cp\u003eA: The Standard BMS board provides core protection functions — overcharge, over-discharge, and short-circuit cutoff. The Balance version adds an active cell-balancing circuit that equalises the voltage of each individual cell during charging. This extends the overall lifespan of your 2S lithium pack and ensures more consistent performance across charge cycles.\u003c\/p\u003e\n\u003ch4\u003eQ: What charging voltage does this BMS board support?\u003c\/h4\u003e\n\u003cp\u003eA: This 2S BMS protection board supports a charging input voltage of 8.4V to 9.0V, which is the standard range for fully charging a 2-cell series 18650 lithium-ion pack. Always use a compatible lithium charger to ensure safe operation.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this board compatible with all 18650 lithium cells?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, this board is designed for use with standard 18650 lithium-ion cells wired in a 2S (two-cell series) configuration. It is suitable for most reputable 18650 cells commonly used in DIY battery builds, provided the discharge current does not exceed the rated 20A continuous limit.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does a 2S BMS protection board do for my lithium battery pack?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A 2S BMS (Battery Management System) board monitors and protects your two-cell lithium battery pack. It prevents overcharging, over-discharging, and short-circuit events that could damage your cells or create a safety hazard. This makes it a must-have component for any DIY 18650 lithium battery project operating at 7.4V \/ 8.4V.\"}}, {\"@type\": \"Question\", \"name\": \"What is the difference between the Standard and Balance versions?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The Standard BMS board provides core protection functions — overcharge, over-discharge, and short-circuit cutoff. The Balance version adds an active cell-balancing circuit that equalises the voltage of each individual cell during charging. This extends the overall lifespan of your 2S lithium pack and ensures more consistent performance across charge cycles.\"}}, {\"@type\": \"Question\", \"name\": \"What charging voltage does this BMS board support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This 2S BMS protection board supports a charging input voltage of 8.4V to 9.0V, which is the standard range for fully charging a 2-cell series 18650 lithium-ion pack. Always use a compatible lithium charger to ensure safe operation.\"}}, {\"@type\": \"Question\", \"name\": \"Is this board compatible with all 18650 lithium cells?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes, this board is designed for use with standard 18650 lithium-ion cells wired in a 2S (two-cell series) configuration. It is suitable for most reputable 18650 cells commonly used in DIY battery builds, provided the discharge current does not exceed the rated 20A continuous limit.\"}}]}\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\": \"2S 20A BMS Board 7.4V 8.4V 18650 Lithium Battery Protection\", \"item\": \"https:\/\/n8ande-60.myshopify.com\/products\/2s-20a-bms-board-7-4v-8-4v-18650-lithium-battery-protection\"}]}\u003c\/script\u003e","brand":"Axl","offers":[{"title":"Balance","offer_id":43692924207165,"sku":"14:29#Balance","price":7.81,"currency_code":"USD","in_stock":true},{"title":"Standard","offer_id":43692924239933,"sku":"14:10#Standard","price":7.96,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0671\/3439\/0333\/files\/Sffe3fcc6617142c792dfc4bb786f2b45E.webp?v=1790180478","url":"https:\/\/qtiply.com\/products\/2s-20a-bms-board-7-4v-8-4v-18650-lithium-battery-protection","provider":"QTP","version":"1.0","type":"link"}