{"product_id":"21v-18650-battery-protection-board-temperature-control-side-lights","title":"21V 18650 Battery Protection Board with Temperature Control","description":"\u003ch2\u003e21V 18650 Battery Protection Board with Temperature Control\u003c\/h2\u003e\n\u003cp\u003eKeep your power tools running safely and efficiently with this \u003cstrong\u003e21V 18650 Side Lights Battery Protection Board with Temperature Control\u003c\/strong\u003e. Designed for use with angle grinding machines, electric scissors, and electric hammers, this compact plastic PCB module provides essential over-charge, over-discharge, and over-current safeguards for 18650 lithium-ion battery packs — all while monitoring temperature to help prevent overheating during demanding tasks.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e21V Rated Voltage:\u003c\/strong\u003e Compatible with standard 18650 lithium-ion battery configurations used in common cordless power tools.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Control:\u003c\/strong\u003e Built-in temperature sensing helps regulate battery performance and reduces the risk of overheating.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSide Indicator Lights:\u003c\/strong\u003e Convenient LED side lights give you at-a-glance status monitoring of the protection board's operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Tool Compatibility:\u003c\/strong\u003e Suitable for angle grinders, electric scissors, electric hammers, and similar 21V cordless devices.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Plastic Housing:\u003c\/strong\u003e Lightweight yet sturdy plastic construction designed to withstand the rigors of regular workshop use.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Design:\u003c\/strong\u003e Low-profile form factor fits neatly into compatible tool battery housings without bulk.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 21V 18650 Battery Protection Board with Temperature Control \u0026amp; Side Indicator Lights\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 21V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Type:\u003c\/strong\u003e 18650 Lithium-Ion\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic (PCB)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplicable Tools:\u003c\/strong\u003e Angle Grinding Machine, Electric Scissors, Electric Hammer\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFeature:\u003c\/strong\u003e Temperature Control, Side Indicator Lights, Over-current \u0026amp; Over-voltage Protection\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, hobbyist, or professional tradesperson, this protection board is a cost-effective way to extend the life of your 18650 battery packs and keep your cordless power tools performing at their best. It's also a practical spare to keep on hand for battery pack repairs and rebuilds.\u003c\/p\u003e\n\n\u003cp\u003eFor more information on safe electrical component handling, visit the U.S. Consumer Product Safety Commission – Lithium Battery Safety.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What tools is the 21V 18650 Battery Protection Board compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This 21V 18650 protection board is designed for use with cordless power tools that use 18650 lithium-ion battery packs, including angle grinding machines, electric scissors, and electric hammers. Always verify your tool's voltage and battery configuration before installation.\u003c\/p\u003e\n\u003ch4\u003eQ: What does the temperature control feature do on this protection board?\u003c\/h4\u003e\n\u003cp\u003eA: The built-in temperature control monitors the battery pack's operating temperature during use. If the temperature exceeds a safe threshold, the protection circuit can help limit output to prevent overheating and extend overall battery life.\u003c\/p\u003e\n\u003ch4\u003eQ: What do the side indicator lights on the board show?\u003c\/h4\u003e\n\u003cp\u003eA: The side LED indicator lights provide a visual status readout of the protection board's operation, making it easy to confirm the board is active and functioning correctly at a glance during use or charging.\u003c\/p\u003e\n\u003ch4\u003eQ: What material is this protection board made from?\u003c\/h4\u003e\n\u003cp\u003eA: The board is constructed from durable plastic (PCB material), keeping it lightweight and resistant to the everyday wear of workshop environments while housing the internal protection circuitry.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What tools is the 21V 18650 Battery Protection Board compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This 21V 18650 protection board is designed for use with cordless power tools that use 18650 lithium-ion battery packs, including angle grinding machines, electric scissors, and electric hammers. 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