{"product_id":"5s-bms-18v-21v-20a-li-ion-battery-protection-circuit-board","title":"5S BMS 18V 21V 20A Li-Ion Battery Protection Circuit Board","description":"\n\u003ch2\u003e5S BMS Battery Protection Circuit Board – 18V\/21V 20A for Li-Ion Power Tool Packs\u003c\/h2\u003e\n\u003cp\u003eKeep your 5-series lithium battery packs running safely and efficiently with this compact \u003cstrong\u003e5S BMS (Battery Management System) Protection Circuit Board\u003c\/strong\u003e. Designed specifically for 18V\/21V electric power tools — including cordless drills, screwdrivers, and impact drivers — this module monitors voltage, current, and temperature in real time to guard your battery investment.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5S Li-Ion Compatible:\u003c\/strong\u003e Works with lithium iron phosphate, lithium manganese, lithium cobalt, ternary, and other common 5-series lithium chemistries.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Layer Protection:\u003c\/strong\u003e Built-in overcharge protection, over-discharge protection, and short-circuit protection for safe operation at all times.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDedicated 5S IC Processor:\u003c\/strong\u003e Uses a specialized integrated circuit to monitor each cell's voltage, charge\/discharge current, and ambient temperature in real time.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdjustable Discharge Current:\u003c\/strong\u003e Discharge current is adjustable up to 10A, with overdischarge protection triggering at 35±10A.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Low Power Consumption:\u003c\/strong\u003e Working current of just ~25µA and quiescent current of ~6µA — minimal drain on your battery at rest.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWaterproof \u0026amp; Moisture-Resistant Coating:\u003c\/strong\u003e Protective conformal coating on components guards against water, condensation, and humidity.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Easy to Install:\u003c\/strong\u003e Slim profile at just 46×40×3.6mm fits neatly inside standard power tool battery housings.\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\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e18V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharging Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e21V – 24V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharging Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1A – 3A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDischarge Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10A (adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOverdischarge Protection Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e35 ± 10A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBoard Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e46 × 40 × 3.6 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~25µA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eQuiescent Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~6µA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Battery Types\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLi-Ion (LiFePO4, LiMn, LiCoO2, Ternary, etc.)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5S 21V power tools, cordless drills, screwdrivers\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 × 5S BMS 18V\/21V 20A Li-Ion Battery Protection Circuit Board\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: Battery, charger, and power tool are NOT included.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eLooking for more tools and accessories? You may also like:\u003cbr\u003e\n\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\u003cbr\u003e\n\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003cbr\u003e\n\u003ca href=\"\/products\/360-bicycle-chain-cleaner-tool-gear-cleaning-kit\"\u003e360° Bicycle Chain Cleaner Tool | Bike Gear Cleaning Kit\u003c\/a\u003e\n\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 battery types is this 5S BMS protection board compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This 5S BMS circuit board is compatible with a wide range of 5-series lithium battery chemistries, including lithium iron phosphate (LiFePO4), lithium manganese (LiMn), lithium cobalt (LiCoO2), and ternary lithium batteries. It is designed for 18V\/21V battery packs commonly used in cordless power tools.\u003c\/p\u003e\n\u003ch4\u003eQ: Does this board protect against short circuits and overcharging?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The board includes built-in overcharge protection, over-discharge protection, and short-circuit protection. The dedicated 5S IC processor continuously monitors each cell's voltage and current, cutting off the circuit if unsafe conditions are detected.\u003c\/p\u003e\n\u003ch4\u003eQ: What are the dimensions of this BMS board, and will it fit in my power tool battery pack?\u003c\/h4\u003e\n\u003cp\u003eA: The board measures 46mm × 40mm × 3.6mm (length × width × height), making it compact enough to fit inside most standard 21V cordless power tool battery housings, including those for cordless drills and electric screwdrivers.\u003c\/p\u003e\n\u003ch4\u003eQ: Is the protection board waterproof?\u003c\/h4\u003e\n\u003cp\u003eA: The board's components are coated with a protective conformal coating that provides resistance against water, moisture, and condensation — helping ensure reliable performance even in workshop environments where humidity may be a factor.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What battery types is this 5S BMS protection board compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This 5S BMS circuit board is compatible with a wide range of 5-series lithium battery chemistries, including lithium iron phosphate (LiFePO4), lithium manganese (LiMn), lithium cobalt (LiCoO2), and ternary lithium batteries. It is designed for 18V\/21V battery packs commonly used in cordless power tools.\"}}, {\"@type\": \"Question\", \"name\": \"Does this board protect against short circuits and overcharging?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. The board includes built-in overcharge protection, over-discharge protection, and short-circuit protection. The dedicated 5S IC processor continuously monitors each cell's voltage and current, cutting off the circuit if unsafe conditions are detected.\"}}, {\"@type\": \"Question\", \"name\": \"What are the dimensions of this BMS board, and will it fit in my power tool battery pack?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The board measures 46mm × 40mm × 3.6mm (length × width × height), making it compact enough to fit inside most standard 21V cordless power tool battery housings, including those for cordless drills and electric screwdrivers.\"}}, {\"@type\": \"Question\", \"name\": \"Is the protection board waterproof?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The board's components are coated with a protective conformal coating that provides resistance against water, moisture, and condensation — helping ensure reliable performance even in workshop environments where humidity may be a factor.\"}}]}\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\": \"5S BMS 18V 21V 20A Li-Ion Battery Protection Circuit Board\", \"item\": \"https:\/\/n8ande-60.myshopify.com\/products\/5s-bms-18v-21v-20a-li-ion-battery-protection-circuit-board\"}]}\u003c\/script\u003e","brand":"Axl","offers":[{"title":"1pc","offer_id":43692570050621,"sku":"14:771#1pc","price":13.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0671\/3439\/0333\/files\/S83347a2529414fbca46b0a8fc42e2355C.webp?v=1790177325","url":"https:\/\/qtiply.com\/products\/5s-bms-18v-21v-20a-li-ion-battery-protection-circuit-board","provider":"QTP","version":"1.0","type":"link"}