{"product_id":"5s-21v-lithium-battery-protection-board-pcb-charge-module-power-tools","title":"5S 21V Lithium Battery Protection Board PCB Charge Module","description":"\n\u003ch2\u003e5S 21V Lithium Battery Protection Board — PCB Charge Module for Power Tools\u003c\/h2\u003e\n\u003cp\u003eKeep your cordless power tools running safely and efficiently with this \u003cstrong\u003e5S 21V Lithium Battery Protection Board\u003c\/strong\u003e. Designed for 5-cell (21V) lithium battery packs used in screwdrivers and other power tools, this compact PCB module delivers real-time monitoring and multi-layer protection to extend battery life and prevent damage.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReal-Time Monitoring:\u003c\/strong\u003e Uses a dedicated IC processor to continuously track voltage, charge\/discharge current, and ambient temperature across each battery cell.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOvercharge Protection:\u003c\/strong\u003e Automatically cuts off charging when cells reach full capacity, preventing damage from excess voltage.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOver-Discharge Protection:\u003c\/strong\u003e Disconnects the load when battery voltage drops too low, preserving cell health and longevity.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShort Circuit Protection:\u003c\/strong\u003e Instantly interrupts the circuit in the event of a short, safeguarding both the battery and connected tools.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3-MOS Design:\u003c\/strong\u003e Three MOSFET switches provide stable, reliable charge and discharge management for consistent performance.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Board-Ready:\u003c\/strong\u003e Measures 90.3 × 67.06 mm — easy to integrate into standard cordless tool battery packs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable PCB Construction:\u003c\/strong\u003e High-quality printed circuit board material built to withstand the demands of regular workshop use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Battery Configuration:\u003c\/strong\u003e 5S (5-cell) Lithium-Ion \/ Li-Ion\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRated Voltage:\u003c\/strong\u003e 21V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBoard Dimensions:\u003c\/strong\u003e 90.3 × 67.06 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMOSFET Count:\u003c\/strong\u003e 3 MOS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e PCB (Printed Circuit Board)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Screwdrivers, cordless drills, and compatible 21V power tools\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho Is This For?\u003c\/h3\u003e\n\u003cp\u003eWhether you're a DIY enthusiast rebuilding a battery pack or a professional technician maintaining a fleet of power tools, this protection board is an essential component. It's also a practical and thoughtful gift for makers, hobbyists, and anyone who works with rechargeable lithium battery systems.\u003c\/p\u003e\n\n\u003ch3\u003eLearn More About Lithium Battery Safety\u003c\/h3\u003e\n\u003cp\u003eProper battery management is critical for safety and performance. For general guidance on electrical safety standards and battery handling, visit the U.S. Consumer Product Safety Commission (CPSC) Battery Safety page.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does the 5S 21V Lithium Battery Protection Board do?\u003c\/h4\u003e\n\u003cp\u003eA: This PCB protection module continuously monitors the voltage, charge\/discharge current, and temperature of each cell in a 5S (21V) lithium battery pack. It actively guards against overcharging, over-discharging, and short circuits — keeping your battery pack and connected power tools operating safely.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What power tools is this protection board compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This module is designed for 5-cell (5S) 21V lithium battery packs, making it compatible with most cordless screwdrivers, drills, and similar 21V power tools that use this cell configuration. Always verify your existing battery pack's cell count and voltage before installation.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What are the dimensions of this PCB module?\u003c\/h4\u003e\n\u003cp\u003eA: The board measures 90.3 × 67.06 mm, making it a compact, easy-to-fit solution for standard cordless tool battery housings.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this board difficult to install?\u003c\/h4\u003e\n\u003cp\u003eA: Installation requires basic electronics knowledge, including soldering and understanding of battery wiring. It is recommended for users comfortable with PCB assembly or battery pack rebuilding. Always follow proper electrical safety precautions when working with lithium cells.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does the 5S 21V Lithium Battery Protection Board do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This PCB protection module continuously monitors the voltage, charge\/discharge current, and temperature of each cell in a 5S (21V) lithium battery pack. 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