{"product_id":"2s-5a-bms-protection-board-for-7-4v-8-4v-18650-li-ion-battery","title":"2S 5A BMS Protection Board for 7.4V 8.4V 18650 Li-ion Battery","description":"\n\u003ch2\u003e2S 5A BMS PCM Protection Board for 7.4V–8.4V 18650 Lithium Battery Packs\u003c\/h2\u003e\n\u003cp\u003eKeep your 2-cell lithium battery packs safe and performing at their best with this compact \u003cstrong\u003e2S 5A Battery Management System (BMS) Protection Board\u003c\/strong\u003e. Designed for 7.4V nominal \/ 8.4V fully-charged 18650 Li-ion cell configurations, this PCM (Protection Circuit Module) guards against overcharge, over-discharge, and overcurrent — extending the life of your battery packs and the devices they power.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e2S Configuration:\u003c\/strong\u003e Optimized for two-cell series 18650 Li-ion battery packs (7.4V nominal, 8.4V max)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5A Continuous Current:\u003c\/strong\u003e Handles up to 5A charge\/discharge current for reliable performance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOvercharge Protection:\u003c\/strong\u003e Cuts off charging when cell voltage reaches the upper threshold, preventing damage\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOver-Discharge Protection:\u003c\/strong\u003e Disconnects load before cells drop to unsafe voltage levels\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOvercurrent \u0026amp; Short-Circuit Protection:\u003c\/strong\u003e Instantly responds to current spikes to protect both the board and connected cells\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Operating Temperature:\u003c\/strong\u003e Functions reliably from -40°C to +85°C\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSMD Construction:\u003c\/strong\u003e Compact surface-mount design for easy integration into custom battery cell packs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharging Voltage:\u003c\/strong\u003e 8.4V–9V input charging voltage range\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNo High-Concern Chemicals:\u003c\/strong\u003e Safe for everyday electronics assembly\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\u003e2S (2 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\u003e5A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNominal 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\u003eMax Charge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8.4V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharging Input Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8.4V – 9V\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 Li-ion \/ Lithium\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\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\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNew\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\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWho Is This For?\u003c\/h3\u003e\n\u003cp\u003eThis BMS protection board is ideal for electronics hobbyists, DIY battery pack builders, RC enthusiasts, and engineers who need a reliable, low-cost protection solution for dual-cell 18650 lithium battery assemblies used in laptops, power tools, robotics, and custom electronic projects.\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 2S 5A BMS protection board do for my 18650 lithium battery pack?\u003c\/h4\u003e\n\u003cp\u003eA: A BMS (Battery Management System) protection board monitors and controls the charging and discharging of your Li-ion cells. This 2S 5A board protects your two-cell 18650 pack from overcharge (above 8.4V per cell threshold), over-discharge, overcurrent, and short-circuit conditions — all of which can permanently damage unprotected lithium cells.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this board compatible with all 18650 Li-ion cells?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, this BMS PCM protection board is designed for standard 7.4V (2S) 18650 Li-ion lithium battery configurations. It supports a charging input voltage of 8.4V–9V and handles up to 5A of continuous current, making it compatible with most 18650 cell packs used in DIY electronics projects.\u003c\/p\u003e\n\u003ch4\u003eQ: What is the difference between BMS and PCM?\u003c\/h4\u003e\n\u003cp\u003eA: BMS (Battery Management System) and PCM (Protection Circuit Module) are closely related terms. A PCM typically refers to the basic protection circuitry (overcharge, over-discharge, overcurrent), while a BMS may also include cell balancing. This board provides core PCM protection functions and is commonly referred to as both a BMS and PCM board in the DIY electronics community.\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 5A BMS protection board do for my 18650 lithium battery pack?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A BMS (Battery Management System) protection board monitors and controls the charging and discharging of your Li-ion cells. 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