{"product_id":"18-21v-5s-li-ion-battery-protection-board-20a-circuit-module","title":"18\/21V 5S Li-Ion Battery Protection Board 20A Module","description":"\n\u003ch2\u003e18\/21V 5S Li-Ion Battery Protection Board — 20A Circuit Module\u003c\/h2\u003e\n\u003cp\u003eKeep your lithium battery packs running safely and efficiently with this compact \u003cstrong\u003e5S Li-Ion Battery Protection Board\u003c\/strong\u003e. Designed for 18V and 21V electric power tool battery packs, this 20A protection circuit module uses a dedicated 5-series lithium battery IC to provide real-time monitoring of voltage, charge\/discharge current, and ambient temperature — all in a small 46×40 mm footprint.\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\u003eWide Current Support:\u003c\/strong\u003e Handles 8–20A charge\/discharge current for demanding power tool applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComprehensive Protection Functions:\u003c\/strong\u003e Safeguards against overcharge, over-discharge, and short circuit conditions, with a 1-second overcharge protection delay.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReal-Time IC Monitoring:\u003c\/strong\u003e Special-purpose 5S lithium battery IC continuously monitors each cell's voltage, current, and temperature.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Low Power Consumption:\u003c\/strong\u003e Working current of approximately 25µA; quiescent current as low as 6µA — minimal drain on your battery pack.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Operating Temperature Range:\u003c\/strong\u003e Rated from -55°C to 120°C (operating) and -55°C to 175°C (storage), with humidity tolerance up to RH ≤75%.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIY \u0026amp; Repair Friendly:\u003c\/strong\u003e Easy to integrate into custom or replacement battery pack builds for power tools and similar applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Battery Configuration\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5S Li-Ion (18V \/ 21V)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCurrent Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8–20A\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 at 25°C\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\u003eOvercharge Protection Delay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 second\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 mm\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-55°C to 120°C, RH ≤75%\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-55°C to 175°C, RH ≤75%\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 × Protection Board Module\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Product color and chip layout may vary between production batches, but performance and functionality remain unchanged.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-10g-high-grade-silicon-grease-lubricant-o-lubrication-good-odorless-smoothness-for-o-rings-tube-silicone-grease-lubricant\"\u003e1PC 10g High Grade Silicon Grease Lubricant for O-Rings \u0026amp; Tubes\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-large-capacity-battery-storage-organizer-box-batteries-not-included-vintage-beer-crate-appearance-holds-30-aaa-batteries\"\u003e1PC Large Capacity Battery Storage Organizer Box\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-mobile-data-cable-storage-box-portable-winding-earphone-charger-storage-box-with-lid-drawer-organizer-box\"\u003e1PC Mobile Data Cable \u0026amp; Charger Storage Box with Lid\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 battery configuration is this 5S protection board designed for?\u003c\/h4\u003e\n\u003cp\u003eA: This protection circuit board is specifically designed for \u003cstrong\u003e5-series (5S) Li-Ion battery packs\u003c\/strong\u003e, which operate at 18V to 21V. It is commonly used in electric power tool battery packs and similar DIY battery applications.\u003c\/p\u003e\n\u003ch4\u003eQ: What protection functions does this circuit board provide?\u003c\/h4\u003e\n\u003cp\u003eA: The board offers \u003cstrong\u003eovercharge protection\u003c\/strong\u003e (with a 1-second delay), \u003cstrong\u003eover-discharge protection\u003c\/strong\u003e, and \u003cstrong\u003eshort circuit protection\u003c\/strong\u003e. The built-in 5S IC monitors each cell's voltage, current, and temperature in real time to ensure stable, safe operation.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this protection board suitable for DIY battery pack builds?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! This module is ideal for DIY electrical projects and battery pack repairs. It is compact at 46×40 mm and supports 8–20A of current, making it a great fit for custom electric power tool battery packs. Always ensure you select the correct protection board for your specific battery configuration before installation.\u003c\/p\u003e\n\u003ch4\u003eQ: Will the board look exactly as pictured?\u003c\/h4\u003e\n\u003cp\u003eA: The board's color and chip layout may differ slightly between production batches, but these cosmetic differences do not affect the board's performance or functionality in any way.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What battery configuration is this 5S protection board designed for?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This protection circuit board is specifically designed for 5-series (5S) Li-Ion battery packs, which operate at 18V to 21V. It is commonly used in electric power tool battery packs and similar DIY battery applications.\"}}, {\"@type\": \"Question\", \"name\": \"What protection functions does this circuit board provide?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The board offers overcharge protection (with a 1-second delay), over-discharge protection, and short circuit protection. The built-in 5S IC monitors each cell's voltage, current, and temperature in real time to ensure stable, safe operation.\"}}, {\"@type\": \"Question\", \"name\": \"Is this protection board suitable for DIY battery pack builds?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! This module is ideal for DIY electrical projects and battery pack repairs. It is compact at 46×40 mm and supports 8–20A of current, making it a great fit for custom electric power tool battery packs. Always ensure you select the correct protection board for your specific battery configuration before installation.\"}}, {\"@type\": \"Question\", \"name\": \"Will the board look exactly as pictured?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The board's color and chip layout may differ slightly between production batches, but these cosmetic differences do not affect the board's performance or functionality in any way.\"}}]}\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:\/\/x1davz-b4.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home page\", \"item\": \"https:\/\/x1davz-b4.myshopify.com\/collections\/frontpage\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"18\/21V 5S Li-Ion Battery Protection Board 20A Module\", \"item\": \"https:\/\/x1davz-b4.myshopify.com\/products\/18-21v-5s-li-ion-battery-protection-board-20a-circuit-module\"}]}\u003c\/script\u003e","brand":"Nixie","offers":[{"title":"B-3MOS","offer_id":67607665639523,"sku":"1005012698063381-B-3MOS","price":10.35,"currency_code":"USD","in_stock":true},{"title":"A-3MOS","offer_id":67607665672291,"sku":"1005012698063381-A-3MOS","price":10.71,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0784\/2047\/6003\/files\/S32ea1fc73aa8443aa33b4ce5345e8414E.webp?v=1790768311","url":"https:\/\/nixiehaven.com\/products\/18-21v-5s-li-ion-battery-protection-board-20a-circuit-module","provider":"Nixie","version":"1.0","type":"link"}