{"product_id":"8-4v-usb-lithium-battery-charger-cable-vacuum-cleaner-cordless","title":"8.4V USB Lithium Battery Charger Cable – Vacuum Cleaner","description":"\n\u003ch2\u003e8.4V USB Lithium Battery Charger Cable for Vacuum Cleaners \u0026amp; Cordless Devices\u003c\/h2\u003e\n\u003cp\u003eKeep your cordless vacuum cleaner, robot vacuum, and handheld devices fully charged and ready to go with this compact \u003cstrong\u003e8.4V USB Lithium Battery Charger Cable\u003c\/strong\u003e. Designed for convenience and safety, this plug-and-charge adapter converts a standard USB power source into the precise 8.4V DC output needed to charge lithium-ion and lithium-polymer battery packs — no bulky wall adapter required.\u003c\/p\u003e\n\n\u003cp\u003eBuilt from durable ABS plastic with a smart CC-CV (Constant Current–Constant Voltage) charging mode, it delivers a stable, efficient charge every time. The built-in multi-layer protection system — covering overvoltage, overcurrent, overload, and short-circuit scenarios — ensures your battery and device stay safe throughout the entire charging cycle.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUniversal USB Input:\u003c\/strong\u003e Charges from any USB port — power banks, laptop USB ports, USB wall adapters, and car chargers\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e8.4V DC Output:\u003c\/strong\u003e Ideal for 2S lithium-ion and lithium-polymer battery packs (nominal 7.4V ±5%)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCC-CV Charging Mode:\u003c\/strong\u003e Maximizes battery health and charging efficiency\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLED Charge Indicator:\u003c\/strong\u003e Red light = charging in progress; Green light = fully charged\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDC 5.5 × 2.1–2.5mm Connector:\u003c\/strong\u003e Inner positive (+), outer negative (−) polarity\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMulti-Protection Circuit:\u003c\/strong\u003e Overvoltage, overcurrent, overload, and short-circuit protection built in\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Portable:\u003c\/strong\u003e Lightweight cable design — toss it in your bag or keep it in the car\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Fits car and household cordless vacuum cleaners and other devices with a matching DC barrel port\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable ABS Plastic Construction:\u003c\/strong\u003e Built to withstand everyday use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"border-collapse:collapse;width:100%\"\u003e\n  \u003ctr style=\"background:#f5f5f5\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003e\u003cstrong\u003eInput\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003eUSB (5V)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003e\u003cstrong\u003eOutput Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003e8.4V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003e\u003cstrong\u003eCharging Mode\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003eCC-CV (Constant Current – Constant Voltage)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003e\u003cstrong\u003eCharging Indicator\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003eRed = Charging \/ Green = Fully Charged\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003e\u003cstrong\u003eCharging Port\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003eDC 5.5 × 2.1–2.5mm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003e\u003cstrong\u003ePolarity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003eInner (+), Outer (−)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003e\u003cstrong\u003eProtection\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003eOvervoltage, Overcurrent, Overload, Short-Circuit\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003e\u003cstrong\u003eCompatible Batteries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003eLithium-ion \u0026amp; Lithium-polymer (nominal voltage ±5%)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5\"\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003eABS Plastic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;border:1px solid #ddd\"\u003eMainland 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 × 8.4V USB Lithium Battery Charger Cable\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eNotes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eColors may vary slightly from images due to monitor brightness and lighting conditions.\u003c\/li\u003e\n  \u003cli\u003ePlease allow for minor measurement tolerances.\u003c\/li\u003e\n  \u003cli\u003eConfirm your device's DC port size and battery voltage before purchasing.\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\/1-channel-relay-module-dc-3-3v-24v-optocoupler-arduino\"\u003e1-Channel Relay Module DC 3.3V–24V Optocoupler for Arduino\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/0-25mm-1000-turn-precision-copper-inductor-coil-diy-electronics\"\u003e0.25mm 1000-Turn Precision Copper Inductor Coil for DIY Circuits\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more information on lithium battery safety and handling, visit the U.S. Consumer Product Safety Commission – Lithium Battery Safety.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What devices is this 8.4V USB lithium battery charger compatible with?\u003c\/h4\u003e\n\u003cp\u003eA: This charger is designed for cordless and robot vacuum cleaners, handheld car vacuums, and other devices powered by 2S lithium-ion or lithium-polymer battery packs with a nominal voltage of 7.4V (±5%) and a DC 5.5 × 2.1–2.5mm charging port. Always verify your device's port size and battery voltage before use.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I use this charger with a power bank or laptop USB port?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The charger accepts a standard USB (5V) input, so it works with any USB power source — including power banks, laptop USB ports, USB wall adapters, and USB car chargers — making it very convenient for charging on the go.\u003c\/p\u003e\n\u003ch4\u003eQ: How do I know when my device is fully charged?\u003c\/h4\u003e\n\u003cp\u003eA: The built-in LED indicator makes it simple: a \u003cstrong\u003ered light\u003c\/strong\u003e means charging is in progress, and a \u003cstrong\u003egreen light\u003c\/strong\u003e means the battery is fully charged. Once you see green, it's safe to disconnect.\u003c\/p\u003e\n\u003ch4\u003eQ: Is it safe to leave this charger connected overnight?\u003c\/h4\u003e\n\u003cp\u003eA: The charger features multi-layer protection including overvoltage, overcurrent, overload, and short-circuit safeguards. However, as with all battery chargers, it is generally recommended not to leave devices unattended while charging for extended periods as a general safety best practice.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What devices is this 8.4V USB lithium battery charger compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This charger is designed for cordless and robot vacuum cleaners, handheld car vacuums, and other devices powered by 2S lithium-ion or lithium-polymer battery packs with a nominal voltage of 7.4V (±5%) and a DC 5.5 × 2.1–2.5mm charging port. Always verify your device's port size and battery voltage before use.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use this charger with a power bank or laptop USB port?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes! 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