{"product_id":"5v-to-21v-boost-cable-usb-dc-adapter-21v-battery-charging","title":"5V to 21V Boost Cable – USB DC Adapter for 21V Battery Charging","description":"\n\u003ch2\u003e5V to 21V Boost Charging Cable – USB to DC Adapter\u003c\/h2\u003e\n\u003cp\u003eKeep your 21V power tool batteries topped up anywhere you have a standard 5V USB charging head. This compact boost cable steps up voltage from 5V to 21V, giving you a convenient way to charge compatible 21V batteries using a common USB power source — no proprietary charger required.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage Boost:\u003c\/strong\u003e Converts 5V USB input to 21V DC output for compatible battery charging\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDC Interface:\u003c\/strong\u003e Standard DC connector for secure, stable connection to 21V battery packs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Built from high-quality plastic materials for long-lasting everyday use\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGenerous Length:\u003c\/strong\u003e Approx. 73 cm (about 28.7 in) cable for flexible positioning during charging\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal Compatibility:\u003c\/strong\u003e Works with 21V battery packs and standard 5V USB charging heads\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReplacement Ready:\u003c\/strong\u003e Perfect replacement for damaged or worn-out charging cables\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand New \u0026amp; Unused:\u003c\/strong\u003e Supplied in original, unused condition straight from the manufacturer\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Name\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5V to 21V Boost Cable\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic\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\u003eCable Length\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 73 cm (~28.7 in)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5V (USB)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e21V (DC)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatibility\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e21V battery packs \/ 5V USB charging heads\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × 5V to 21V Boost Cable\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eActual color may vary slightly from images due to monitor brightness and lighting conditions.\u003c\/li\u003e\n  \u003cli\u003ePlease allow a slight deviation (±1–2 cm) in manual measurements.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10pcs-wooden-handle-nylon-bristle-paint-brush-for-oil-painting-dusting-and-cleaning-unrechargeable-hand-tool-set-without-batt-2\"\u003e10Pcs Wooden Handle Nylon Bristle Paint Brush Set – Hand Tool Accessory\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-precision-japanese-double-edged-hand-saw-sk5-steel-fine-toothed-for-carpentry-and-gardening-6-inch-blade-portable-mini-1\"\u003e1pc Precision Japanese Double-Edged Hand Saw – SK5 Steel, Portable Mini\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-professional-heavy-duty-pruning-shears-with-anti-slip-handle-design-suitable-for-trimming-thick-and-sturdy-branches\"\u003e1pc Professional Heavy-Duty Pruning Shears with Anti-Slip Handle\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: What does this 5V to 21V boost cable do?\u003c\/h4\u003e\n\u003cp\u003eA: This boost cable steps up the voltage from a standard 5V USB power source (such as a USB wall adapter or power bank) to 21V DC output, allowing you to charge compatible 21V battery packs without a dedicated proprietary charger.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this cable compatible with all 21V battery packs?\u003c\/h4\u003e\n\u003cp\u003eA: This cable is designed for use with 21V battery packs that accept a standard DC interface connector. We recommend verifying your battery pack's input connector type and specifications before purchasing to ensure compatibility.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use this cable with any 5V USB charger?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — this boost cable is designed to work with standard 5V USB charging heads, including USB wall adapters and power banks. Please ensure your USB source can supply adequate current for your specific battery charging requirements.\u003c\/p\u003e\n\u003ch4\u003eQ: How long is the cable?\u003c\/h4\u003e\n\u003cp\u003eA: The cable measures approximately 73 cm (about 28.7 inches) in length, giving you flexible reach during charging sessions.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does this 5V to 21V boost cable do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This boost cable steps up the voltage from a standard 5V USB power source (such as a USB wall adapter or power bank) to 21V DC output, allowing you to charge compatible 21V battery packs without a dedicated proprietary charger.\"}}, {\"@type\": \"Question\", \"name\": \"Is this cable compatible with all 21V battery packs?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This cable is designed for use with 21V battery packs that accept a standard DC interface connector. 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