{"product_id":"21v-bms-battery-case-18650-power-tool-storage-box","title":"21V BMS Battery Case for 18650 Power Tools – Storage Box","description":"\n\u003ch2\u003e21V BMS Battery Storage Case for 18650 Li-Ion Cells\u003c\/h2\u003e\n\u003cp\u003eBuild your own high-performance 21V lithium battery pack for cordless power tools with this BMS (Battery Management System) storage case. Designed for 10S 18650 cell configurations, this compact housing pairs with a dedicated BMS protection board to deliver stable, reliable power for angle grinders, cutting tools, and other wireless electric power tools. \u003cstrong\u003eNote: Batteries and charger are NOT included.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e⚠️ Important:\u003c\/strong\u003e Always charge using a 21V DC lithium battery charger. Do not charge through the discharge port.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e10S Li-Ion BMS Compatible:\u003c\/strong\u003e Uses a dedicated IC for 10-series 18650 lithium batteries to monitor real-time voltage, charge\/discharge current, and ambient temperature.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Layer Protection:\u003c\/strong\u003e Built-in overcharge protection, over-discharge protection, and short-circuit protection for safer, longer-lasting battery operation.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Low Power Consumption:\u003c\/strong\u003e Working current ~25µA; quiescent current ~6µA — extends overall battery life.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eContinuous Discharge Current:\u003c\/strong\u003e 8–20A continuous discharge output, suitable for demanding power tool applications.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCharge Voltage:\u003c\/strong\u003e 21V total; 4.25V per single cell charge voltage.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNickel Strip Thickness:\u003c\/strong\u003e 0.15mm for reliable cell connections.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact Black Housing:\u003c\/strong\u003e Dimensions: 4.53 × 2.87 × 2.56 in (11.5 × 7.3 × 6.5 cm). Easy to integrate into DIY power tool builds.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharge Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e21V (4.25V per cell)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDischarge Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8–20A continuous\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~25µA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eQuiescent Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e~6µA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eNickel Thickness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.15mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e11.5 × 7.3 × 6.5 cm \/ 4.53 × 2.87 × 2.56 in\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBattery Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCharger Included\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNo\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× BMS 21V Power Tool Battery Case\/Storage Box Set\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cem\u003eNote: Minor component variations (e.g. resistors or diodes) may occur as part of ongoing product improvements and do not affect performance or function.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/360-bicycle-chain-cleaner-tool-gear-cleaning-kit\"\u003e360° Bicycle Chain Cleaner Tool | Bike Gear Cleaning Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Does this 21V BMS battery case come with 18650 batteries or a charger?\u003c\/h4\u003e\n\u003cp\u003eA: No — this listing is for the battery storage case\/housing and BMS board only. You will need to source compatible 18650 lithium cells and a 21V DC lithium battery charger separately to complete your battery pack build.\u003c\/p\u003e\n\u003ch4\u003eQ: What power tools is this 21V BMS battery storage box compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This case is designed primarily for cordless\/wireless electric power tools such as angle grinders and cutting tools that operate on a 21V lithium battery pack. It is ideal for DIY battery pack builders using 10-series 18650 cells.\u003c\/p\u003e\n\u003ch4\u003eQ: What protection features does this BMS battery case include?\u003c\/h4\u003e\n\u003cp\u003eA: The integrated BMS board provides overcharge protection, over-discharge protection, and short-circuit protection. It continuously monitors cell voltage, charge\/discharge current, and ambient temperature to help extend battery longevity and maintain safe operation.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Does this 21V BMS battery case come with 18650 batteries or a charger?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — this listing is for the battery storage case\/housing and BMS board only. 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