{"product_id":"21700-lithium-battery-bms-circuit-board-power-tools-1","title":"21700 Lithium Battery BMS Circuit Board for Power Tools","description":"\u003ch2\u003e21700 Lithium Battery BMS Board for Power Tools\u003c\/h2\u003e\n\u003cp\u003eKeep your power tools running at peak performance with this \u003cstrong\u003e21700 Lithium Battery BMS (Battery Management System) Circuit Board\u003c\/strong\u003e. Engineered for compatibility with 21V cordless power tool battery packs, this PCB delivers reliable charge and discharge management in a compact, durable form factor. Whether you're rebuilding a battery pack or replacing a faulty board, this is a dependable solution for DIY enthusiasts and professional tradespeople alike.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDesigned for 21700 Cells:\u003c\/strong\u003e Optimized for use with 21700 lithium-ion cells commonly found in 21V cordless power tool battery packs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Management System (BMS):\u003c\/strong\u003e Manages charge and discharge cycles, helping to maintain consistent output and extend overall battery pack service life.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact PCB Design:\u003c\/strong\u003e Measures 98 × 60 mm (3.86 × 2.36 in) — a well-proportioned board that fits neatly into standard power tool battery housings.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Built on a high-quality PCB substrate engineered to withstand the demands of regular power tool use.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Suitable for a range of 21V lithium battery packs used in popular cordless power tool systems.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy Integration:\u003c\/strong\u003e Designed for straightforward installation, making battery pack rebuilds and repairs accessible for experienced DIYers and technicians.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCell Compatibility:\u003c\/strong\u003e 21700 Lithium-Ion\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 21V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBoard Dimensions:\u003c\/strong\u003e 98 × 60 mm \/ 3.86 × 2.36 in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e PCB (Printed Circuit Board)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Battery Management System (BMS)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWho Is This For?\u003c\/h3\u003e\n\u003cp\u003eThis BMS circuit board is ideal for hobbyists, electronics repair technicians, and professional tradespeople who need a reliable replacement or upgrade board for their 21V cordless tool battery packs. It's also a great addition to any DIY battery-building project using 21700 lithium cells.\u003c\/p\u003e\n\n\u003ch3\u003eSafety Information\u003c\/h3\u003e\n\u003cp\u003eAlways follow proper electrical safety practices when working with lithium battery cells and circuit boards. Ensure cells are fully discharged before handling. For guidance on electrical safety best practices, visit the U.S. Consumer Product Safety Commission (CPSC) Lithium Battery Safety page.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Printed_circuit_board\" target=\"_blank\" rel=\"noopener\"\u003ePrinted circuit board\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What is a BMS circuit board and what does it do in a lithium battery pack?\u003c\/h4\u003e\n\u003cp\u003eA: A BMS (Battery Management System) circuit board monitors and manages the charge and discharge of lithium-ion cells within a battery pack. It helps maintain balanced cell voltages, prevents overcharge or over-discharge, and contributes to the overall longevity and consistent performance of the battery pack in cordless power tools.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What are the dimensions of this 21700 lithium battery BMS board?\u003c\/h4\u003e\n\u003cp\u003eA: This BMS circuit board measures 98 × 60 mm (3.86 × 2.36 inches), making it well-suited for integration into standard 21V cordless power tool battery housings.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this BMS board compatible with my cordless power tool battery pack?\u003c\/h4\u003e\n\u003cp\u003eA: This board is designed for use with 21V lithium battery packs that use 21700-format lithium-ion cells. It is compatible with a variety of cordless power tool battery systems. We recommend verifying your existing board's dimensions and cell configuration before purchasing to ensure a proper fit.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I install this BMS board myself?\u003c\/h4\u003e\n\u003cp\u003eA: Installation requires experience with electronics, soldering, and lithium battery handling. If you are comfortable with battery pack rebuilds and basic electrical work, this board is designed for straightforward integration. If you are unsure, we recommend consulting a qualified electronics technician.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is a BMS circuit board and what does it do in a lithium battery pack?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"A BMS (Battery Management System) circuit board monitors and manages the charge and discharge of lithium-ion cells within a battery pack. 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