{"product_id":"5s-bms-21v-20a-li-ion-battery-protection-board-power-tool","title":"5S BMS 21V 20A Li-Ion Battery Protection Board for Power Tools","description":"\n\u003ch2\u003e5S BMS 21V 20A Li-Ion Battery Management Protection Board for Electric Drills \u0026amp; Power Tools\u003c\/h2\u003e\n\n\u003cp\u003eKeep your 5-series lithium-ion battery packs running safely and efficiently with this compact, high-quality \u003cstrong\u003e5S BMS (Battery Management System) Protection Board\u003c\/strong\u003e. Designed specifically for 21V electric drills and cordless power tools, this PCBA board monitors each cell in real time and provides robust multi-layer protection to extend battery life and ensure safe operation every time.\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\u003e5S Li-Ion Compatible:\u003c\/strong\u003e Designed for 5-series lithium-ion battery packs rated at 3.7V per cell (21V total charge voltage).\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReal-Time Cell Monitoring:\u003c\/strong\u003e Uses a dedicated 5S lithium IC processor to continuously detect voltage, charge\/discharge current, and ambient temperature across all cells.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Layer Protection:\u003c\/strong\u003e Built-in safeguards include overcharge protection, over-discharge protection, and short-circuit protection for reliable and safe operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContinuous Discharge Current:\u003c\/strong\u003e Handles 8–20A continuous discharge, making it suitable for demanding power tool applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Low Power Consumption:\u003c\/strong\u003e Working current of approximately 25µA and quiescent current of approximately 6µA — minimal self-drain when idle.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual MOSFET (2 MOS) Design:\u003c\/strong\u003e Enhanced switching performance for more efficient charge and discharge cycles.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Form Factor:\u003c\/strong\u003e Measures just 58 × 63 mm — easy to integrate into most battery pack housings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e 5S (5 cells in series)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharge Voltage:\u003c\/strong\u003e 21V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSingle Cell Charge Voltage:\u003c\/strong\u003e 4.25V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOvercharge Detection Voltage (per cell):\u003c\/strong\u003e 4.25V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContinuous Discharge Current:\u003c\/strong\u003e 8–20A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWorking Current:\u003c\/strong\u003e ~25µA\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuiescent Current:\u003c\/strong\u003e ~6µA\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMOSFET Count:\u003c\/strong\u003e 2 MOS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBoard Size:\u003c\/strong\u003e 58 × 63 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModel Number:\u003c\/strong\u003e 5S21V-2MOS\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 5S BMS 21V 20A Li-Ion Battery Protection Board (PCBA)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Battery cells, charger, and power tool are NOT included. Due to manual measurement, please allow a tolerance of 1–3 mm. Actual product color may vary slightly from images due to different monitor display settings.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003cp\u003eLooking for more tools and accessories? Check out these related products from our store:\u003c\/p\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  \u003cli\u003e\u003ca href=\"\/products\/360-bicycle-chain-cleaner-tool-gear-cleaning-kit\"\u003e360° Bicycle Chain Cleaner Tool | Bike Gear Cleaning Kit\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 type of batteries is this 5S BMS protection board compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This BMS protection board is designed for 5-series (5S) lithium-ion (Li-Ion) battery packs with a nominal cell voltage of 3.7V per cell, resulting in a total charge voltage of 21V. It is ideal for use in cordless electric drills and other handheld power tools.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this board include overcharge and over-discharge protection?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The board features built-in overcharge protection, over-discharge protection, and short-circuit protection. The overcharge detection voltage per cell is set at 4.25V, helping to safeguard your battery cells and extend overall pack longevity.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the maximum continuous discharge current supported?\u003c\/h4\u003e\n\u003cp\u003eA: This BMS board supports a continuous discharge current of 8–20A, making it well-suited for the demanding load requirements of electric drills and similar power tools.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Are batteries or a charger included with this BMS board?\u003c\/h4\u003e\n\u003cp\u003eA: No — this listing includes only the BMS protection board (PCBA). Battery cells and charger must be sourced separately and are not included in the package.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What type of batteries is this 5S BMS protection board compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This BMS protection board is designed for 5-series (5S) lithium-ion (Li-Ion) battery packs with a nominal cell voltage of 3.7V per cell, resulting in a total charge voltage of 21V. It is ideal for use in cordless electric drills and other handheld power tools.\"}}, {\"@type\": \"Question\", \"name\": \"Does this board include overcharge and over-discharge protection?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. The board features built-in overcharge protection, over-discharge protection, and short-circuit protection. 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