{"product_id":"21v-pcb-protection-circuit-board-bl1830-bl1840-bl1850-bl1860b-lxt400","title":"21V PCB Protection Board for BL1830 BL1840 BL1850 BL1860B LXT 400","description":"\n\u003ch2\u003e21V Battery Charging PCB Protection Circuit Board – Compatible with BL1830, BL1840, BL1850 \u0026amp; BL1860B LXT 400\u003c\/h2\u003e\n\u003cp\u003eKeep your power tool batteries running safely and efficiently with this 21V Battery Charging PCB Protection Circuit Board. Designed as a direct-fit replacement for a range of popular LXT 400 lithium-ion battery packs, this board safeguards your battery cells against overcharge, over-discharge, and short-circuit conditions — helping extend battery life and maintain reliable performance.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Fits 21V battery models BL1830, BL1840, BL1850, and BL1860B LXT 400 series.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Protection:\u003c\/strong\u003e Built-in circuitry guards against overcharging, over-discharging, and short circuits to keep your batteries safe during every charge cycle.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDirect Replacement:\u003c\/strong\u003e Engineered as a drop-in replacement PCB, making battery repair and restoration straightforward for DIYers and technicians alike.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQuality Construction:\u003c\/strong\u003e Made with reliable components for consistent electrical performance and durability under regular power tool use.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCost-Effective Repair:\u003c\/strong\u003e Restore a failing battery pack at a fraction of the cost of a full battery replacement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Mt21V Protection Board\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 21V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Models:\u003c\/strong\u003e BL1830, BL1840, BL1850, BL1860B (LXT 400 Series)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Includes:\u003c\/strong\u003e 1 × Mt21V PCB Protection Circuit Board\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Made in China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003ePhotos may not reflect actual size — please refer to the specifications above for dimensions.\u003c\/li\u003e\n  \u003cli\u003eMinor measurement differences may occur due to manual measurement.\u003c\/li\u003e\n  \u003cli\u003eColor may vary slightly depending on your monitor settings.\u003c\/li\u003e\n  \u003cli\u003eAlways disconnect the battery from any charger or tool before performing repairs or replacing internal components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eLooking for tools to help with your repair project? Browse our \u003ca href=\"\/products\/1-percent-better-every-day-motivational-canvas-wall-art-print\"\u003eworkshop essentials\u003c\/a\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor general electrical safety guidance, visit the U.S. Consumer Product Safety Commission (CPSC) for tips on safely handling and repairing battery-powered devices.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Which battery models is this 21V PCB protection circuit board compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This circuit board is compatible with 21V lithium-ion battery packs including the BL1830, BL1840, BL1850, and BL1860B models in the LXT 400 series. Always verify your battery model number before purchasing to ensure a proper fit.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What does the PCB protection circuit board do?\u003c\/h4\u003e\n\u003cp\u003eA: The PCB protection circuit board is responsible for monitoring and protecting the battery's cells during charging and discharging. It prevents overcharging, over-discharging, and short circuits — all of which can damage battery cells or create safety hazards during use.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this a difficult repair to perform?\u003c\/h4\u003e\n\u003cp\u003eA: Replacing a PCB protection board requires basic electronics knowledge and soldering skills. If you are comfortable with battery disassembly and soldering, this is a straightforward repair. If you are unsure, we recommend consulting a qualified technician to ensure the repair is done safely and correctly.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Will I receive exactly what is pictured?\u003c\/h4\u003e\n\u003cp\u003eA: Yes, you will receive one (1) Mt21V PCB Protection Circuit Board as described. Please note that due to differences in monitor calibration, the on-screen color may vary slightly from the actual product.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Which battery models is this 21V PCB protection circuit board compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This circuit board is compatible with 21V lithium-ion battery packs including the BL1830, BL1840, BL1850, and BL1860B models in the LXT 400 series. 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