{"product_id":"5s-bms-18v-21v-18650-lithium-battery-protection-board-power-tools","title":"5S BMS 18V\/21V 18650 Lithium Battery Protection Board | Power Tools","description":"\u003ch2\u003e18V\/21V 5S BMS Protection Circuit Board for 18650 Lithium Battery Packs\u003c\/h2\u003e\n\u003cp\u003eKeep your cordless drills and electric power tools running safely and efficiently with this \u003cstrong\u003e5S BMS (Battery Management System) PCBA\u003c\/strong\u003e. Designed for 18650 lithium cell configurations, this protection circuit board manages charging up to \u003cstrong\u003e21V\u003c\/strong\u003e and provides essential overcharge, over-discharge, and short-circuit protection for your 18V drill battery packs.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're rebuilding a worn-out drill battery or building a custom 18650 pack from scratch, this compact and reliable BMS board is the perfect solution for DIY enthusiasts and professional technicians alike.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5S Configuration:\u003c\/strong\u003e Compatible with 5-cell series 18650 lithium battery packs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRated Voltage:\u003c\/strong\u003e 18V nominal \/ 21V maximum charge voltage\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePCBA Design:\u003c\/strong\u003e Fully assembled board ready for integration\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3MOS MOSFET:\u003c\/strong\u003e Triple MOSFET design for improved current handling and stability\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOvercharge Protection:\u003c\/strong\u003e Prevents cells from exceeding safe charge voltage\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOver-Discharge Protection:\u003c\/strong\u003e Safeguards cells from draining below safe thresholds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShort-Circuit Protection:\u003c\/strong\u003e Instantly cuts power in fault conditions\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Form Factor:\u003c\/strong\u003e Easy to fit inside standard drill battery housings\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Suitable for cordless drills, electric screwdrivers, and other 18V power tools\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCell Configuration:\u003c\/strong\u003e 5S (5 cells in series)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Voltage:\u003c\/strong\u003e 18V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharging Voltage:\u003c\/strong\u003e 21V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCell Type:\u003c\/strong\u003e 18650 Lithium-Ion\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMOSFET Count:\u003c\/strong\u003e 3MOS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Concern Chemicals:\u003c\/strong\u003e None\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eMade in Mainland China\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 5S BMS PCBA Protection Circuit Board\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho Is This For?\u003c\/h3\u003e\n\u003cp\u003eThis BMS board is ideal for \u003cstrong\u003eDIY battery pack builders, repair technicians, and electronics hobbyists\u003c\/strong\u003e who want to rebuild or upgrade their cordless drill battery packs. It's a cost-effective way to restore and protect your existing 18V power tool batteries.\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\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\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What battery cell type is this 5S BMS board compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This BMS PCBA is designed for \u003cstrong\u003e18650 lithium-ion cells\u003c\/strong\u003e in a 5S (5 cells in series) configuration, making it suitable for 18V cordless drills and similar electric power tools that charge at up to 21V.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this board provide short-circuit and overcharge protection?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The 5S BMS board includes built-in \u003cstrong\u003eovercharge protection, over-discharge protection, and short-circuit protection\u003c\/strong\u003e via its 3MOS MOSFET design, ensuring your lithium cells operate within safe parameters at all times.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use this BMS board to rebuild my cordless drill battery pack?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. This PCBA is a popular choice for \u003cstrong\u003eDIY battery pack rebuilds\u003c\/strong\u003e. It fits standard 18V drill battery housings and works with most 18650 lithium cell brands, making it an affordable solution for restoring power tool batteries.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What battery cell type is this 5S BMS board compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This BMS PCBA is designed for 18650 lithium-ion cells in a 5S (5 cells in series) configuration, making it suitable for 18V cordless drills and similar electric power tools that charge at up to 21V.\"}}, {\"@type\": \"Question\", \"name\": \"Does this board provide short-circuit and overcharge protection?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. 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