{"product_id":"20x18650-21v-60a-bms-balance-charging-pcb-battery-case-led-indicator","title":"20x18650 21V 60A BMS Balance Charging PCB Battery Case Board","description":"\u003cp\u003ePower your DIY battery projects with confidence using this \u003cstrong\u003e20x18650 21V 60A Lithium-Ion Battery Case with BMS Balance Charging PCB Circuit Board\u003c\/strong\u003e. Designed to house 20 standard 18650 Li-ion cells, this module features a built-in Battery Management System (BMS) that ensures safe, balanced charging and discharging across all cells — protecting your pack from overcharge, over-discharge, and short-circuit events.\u003c\/p\u003e\n\n\u003cp\u003eWhether you're building a custom e-bike battery, a DIY power tool pack, or a portable power station, this rugged plastic and metal enclosure delivers reliable performance in a compact, easy-to-integrate form factor. The integrated LED indicator gives you a clear, at-a-glance view of the battery status at all times.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Fits 20 x 18650 Li-ion cells (cells not included)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Voltage:\u003c\/strong\u003e 21V nominal (5S configuration)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContinuous Discharge Current:\u003c\/strong\u003e Up to 60A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBMS Balance Charging:\u003c\/strong\u003e Active cell balancing for maximum capacity and longevity\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in Protections:\u003c\/strong\u003e Overcharge, over-discharge, overcurrent, and short-circuit protection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLED Indicator:\u003c\/strong\u003e Visual battery level and status display\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible With:\u003c\/strong\u003e BL1860, BL1830 format Li-ion cell packs and similar 18650 cylindrical cells\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Durable plastic shell with metal contact components\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWho Is This For?\u003c\/h2\u003e\n\u003cp\u003eThis battery case and BMS board is ideal for electronics hobbyists, makers, and engineers who need a reliable, high-current 21V lithium battery pack solution. It's a smart choice for power tool battery rebuilds, robotics, electric vehicles, and portable energy storage projects.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCell Compatibility:\u003c\/strong\u003e 18650 Li-ion cylindrical cells\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNumber of Cells:\u003c\/strong\u003e 20 (5S4P configuration)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNominal Voltage:\u003c\/strong\u003e 21V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Continuous Current:\u003c\/strong\u003e 60A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePCB Type:\u003c\/strong\u003e BMS Balance Charging Circuit Board\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic + Metal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIndicator:\u003c\/strong\u003e LED status display\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor guidance on safe handling of lithium-ion battery systems, refer to the U.S. Consumer Product Safety Commission (CPSC) Lithium-Ion Battery Safety resources.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eQ: What does the BMS (Battery Management System) do in this 18650 battery case?\u003c\/h4\u003e\n\u003cp\u003eA: The BMS monitors and manages each cell in the 20x18650 pack, providing active cell balancing during charging, and protecting against overcharge, over-discharge, overcurrent, and short-circuit conditions. This extends battery life and keeps your pack operating safely and efficiently.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Are 18650 cells included with this battery case and PCB board?\u003c\/h4\u003e\n\u003cp\u003eA: No, the 18650 lithium-ion cells are not included. This product includes the battery case enclosure, the BMS balance charging PCB circuit board, and the LED indicator — you supply your own 18650 cells (20 cells required for a full 5S4P 21V pack).\u003c\/p\u003e\n\n\u003ch4\u003eQ: What projects is this 21V 60A BMS battery case suitable for?\u003c\/h4\u003e\n\u003cp\u003eA: This module is well-suited for DIY power tool battery rebuilds (compatible with BL1860\/BL1830 format packs), e-bike battery assemblies, robotics power systems, portable power stations, and other custom electronics projects requiring a reliable 21V high-current lithium battery solution.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is this battery case made of?\u003c\/h4\u003e\n\u003cp\u003eA: The enclosure is constructed from durable plastic with metal contact components, providing a solid, lightweight housing for your 18650 cell pack and BMS PCB board.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does the BMS (Battery Management System) do in this 18650 battery case?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The BMS monitors and manages each cell in the 20x18650 pack, providing active cell balancing during charging, and protecting against overcharge, over-discharge, overcurrent, and short-circuit conditions. 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