{"product_id":"4s-20a-lifepo4-bms-12-8v-14-4v-battery-management-system","title":"4S 20A LiFePO4 BMS 12.8V 14.4V Battery Management System","description":"\n\u003ch2\u003e4S 20A LiFePO4 Battery Management System (BMS) – 12.8V \/ 14.4V\u003c\/h2\u003e\n\u003cp\u003eKeep your LiFePO4 battery pack running safely and efficiently with this compact 4S 20A Battery Management System (BMS). Designed for 32650 and 32700 lithium iron phosphate cells, this balanced BMS provides reliable overcharge, over-discharge, over-current, and short-circuit protection — making it an ideal solution for 12V car batteries, electric boats, UPS (Uninterrupted Power Supply) systems, and computer power setups.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e 4S (4-cell series) | 20A continuous discharge current\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Voltages:\u003c\/strong\u003e 12.8V (nominal) \/ 14.4V (fully charged)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCell Compatibility:\u003c\/strong\u003e 32650 \u0026amp; 32700 LiFePO4 cells\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in Cell Balancing:\u003c\/strong\u003e Passive balancing keeps all cells at equal charge levels, extending overall battery pack lifespan\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComprehensive Protections:\u003c\/strong\u003e Overcharge, over-discharge, over-current, and short-circuit protection circuits\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact SMD Construction:\u003c\/strong\u003e Surface-mount design for a low-profile, space-saving footprint\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Application Range:\u003c\/strong\u003e Suitable for electric boats, 12V automotive batteries, UPS\/backup power supplies, and computer power systems\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Brand new\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 BMS board per order\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCell Configuration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4S (4 cells in series)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eContinuous 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 Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12.8V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14.4V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCell Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLiFePO4 (32650 \/ 32700)\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\u003eCustomizable\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh-Concern Chemicals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat is a BMS and Why Do You Need One?\u003c\/h3\u003e\n\u003cp\u003eA Battery Management System (BMS) is the electronic guardian of your lithium battery pack. It continuously monitors cell voltages, balances charge levels across individual cells, and cuts power in the event of a fault — protecting your cells from damage and your equipment from harm. For any 4S LiFePO4 build, a quality BMS is essential to safe, long-term operation.\u003c\/p\u003e\n\n\u003ch3\u003eIdeal Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDIY 12V LiFePO4 battery packs\u003c\/li\u003e\n  \u003cli\u003eElectric boats \u0026amp; marine applications\u003c\/li\u003e\n  \u003cli\u003eUninterrupted Power Supply (UPS) systems\u003c\/li\u003e\n  \u003cli\u003e12V automotive \/ car battery replacements\u003c\/li\u003e\n  \u003cli\u003eComputer \u0026amp; home backup power\u003c\/li\u003e\n  \u003cli\u003eSolar energy storage projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eYou May Also 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 cell types are compatible with this 4S 20A LiFePO4 BMS?\u003c\/h4\u003e\n\u003cp\u003eA: This BMS is specifically designed for 32650 and 32700 LiFePO4 (lithium iron phosphate) cells wired in a 4-series (4S) configuration, producing a nominal pack voltage of 12.8V and a full-charge voltage of 14.4V.\u003c\/p\u003e\n\u003ch4\u003eQ: Does this BMS include cell balancing?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. This board features built-in passive cell balancing, which helps equalize the charge across all four cells during the charging cycle, improving battery pack longevity and overall performance.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use this BMS for a 12V car battery or marine application?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. This 4S 20A BMS is well-suited for 12V automotive battery replacements, electric boats, UPS backup systems, and other applications requiring a stable, protected 12.8V LiFePO4 power source rated at up to 20A continuous current.\u003c\/p\u003e\n\u003ch4\u003eQ: How many BMS boards come in one order?\u003c\/h4\u003e\n\u003cp\u003eA: Each order includes one (1) BMS board. If you need multiple units for larger battery builds, simply adjust the quantity at checkout.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What cell types are compatible with this 4S 20A LiFePO4 BMS?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This BMS is specifically designed for 32650 and 32700 LiFePO4 (lithium iron phosphate) cells wired in a 4-series (4S) configuration, producing a nominal pack voltage of 12.8V and a full-charge voltage of 14.4V.\"}}, {\"@type\": \"Question\", \"name\": \"Does this BMS include cell balancing?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. 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