{"product_id":"4s-30a-li-ion-18650-battery-protection-board-bms-14-8v","title":"4S 30A Li-ion 18650 Battery Protection Board BMS 14.8V","description":"\u003ch2\u003e4S 30A Lithium Battery Protection Board Module – 14.4V \/ 14.8V \/ 16.8V\u003c\/h2\u003e\n\u003cp\u003eKeep your 4-cell lithium-ion battery packs running safely and efficiently with this high-current 4S 30A BMS (Battery Management System) Protection Board. Designed for 18650 Li-ion battery packs, this compact SMD module provides robust electronic protection against overcharge, over-discharge, over-current, and short-circuit conditions — making it an essential component for DIY battery packs, power tools, e-bikes, laptops, and more.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4S Configuration:\u003c\/strong\u003e Supports 4 cells in series for nominal voltages of 14.4V, 14.8V, and up to 16.8V fully charged.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Current Rating:\u003c\/strong\u003e Continuous current of 15A with a maximum burst current of 30A — ideal for demanding applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOvercharge Protection:\u003c\/strong\u003e Automatically cuts off charging when cells reach their maximum safe voltage, extending battery lifespan.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOver-Discharge Protection:\u003c\/strong\u003e Prevents cells from dropping below safe voltage thresholds to protect cell integrity.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShort-Circuit Protection:\u003c\/strong\u003e Instantly disconnects the circuit in the event of a short, safeguarding your battery pack and connected devices.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOver-Current Protection:\u003c\/strong\u003e Monitors load current and disconnects when unsafe levels are detected.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Operating Temperature:\u003c\/strong\u003e Rated for -40°C to +85°C, suitable for harsh environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSMD Package:\u003c\/strong\u003e Compact surface-mount design for easy integration into custom battery pack builds.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible with 18650 Cells:\u003c\/strong\u003e Works seamlessly with standard 18650 Li-ion battery cells.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eConfiguration\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\u003e15A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMax Burst Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e14.4V \/ 14.8V \/ 16.8V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-40°C to +85°C\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 Module\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  \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\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 4S 30A Li-ion Battery Protection Board Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePerfect For\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDIY 18650 battery pack builds\u003c\/li\u003e\n  \u003cli\u003eLaptop \u0026amp; computer battery replacements\u003c\/li\u003e\n  \u003cli\u003ePower tools and electric vehicles\u003c\/li\u003e\n  \u003cli\u003eRobotics and electronics projects\u003c\/li\u003e\n  \u003cli\u003eRC vehicles and portable power stations\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLooking for more electronics and DIY tools? Check out our \u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e and our \u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge – DIY Tool\u003c\/a\u003e for your workshop needs.\u003c\/p\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 4S 30A lithium battery protection board do?\u003c\/h4\u003e\n\u003cp\u003eA: A 4S 30A BMS (Battery Management System) protection board monitors and manages a 4-cell series lithium-ion battery pack. It protects against overcharge, over-discharge, over-current, and short-circuit conditions, ensuring the battery pack operates safely and maintains a longer service life.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this protection board compatible with 18650 Li-ion battery cells?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, this module is fully compatible with standard 18650 Li-ion cells wired in a 4S (4 series) configuration, supporting pack voltages of 14.4V, 14.8V, and 16.8V depending on cell chemistry and charge state.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the maximum current this board can handle?\u003c\/h4\u003e\n\u003cp\u003eA: The board supports a continuous discharge current of 15A and a maximum burst current of 30A, making it suitable for high-demand applications such as power tools, e-bikes, and robotics.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does a 4S 30A lithium battery protection board do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A 4S 30A BMS (Battery Management System) protection board monitors and manages a 4-cell series lithium-ion battery pack. 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