8.4V USB Lithium Battery Charger Cable – Vacuum Cleaner

8.4V USB Lithium Battery Charger Cable for Vacuum Cleaners & Cordless Devices

Keep your cordless vacuum cleaner, robot vacuum, and handheld devices fully charged and ready to go with this compact 8.4V USB Lithium Battery Charger Cable. 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.

Built 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.

Made in Mainland China.

Key Features

• Universal USB Input: Charges from any USB port — power banks, laptop USB ports, USB wall adapters, and car chargers
• 8.4V DC Output: Ideal for 2S lithium-ion and lithium-polymer battery packs (nominal 7.4V ±5%)
• CC-CV Charging Mode: Maximizes battery health and charging efficiency
• LED Charge Indicator: Red light = charging in progress; Green light = fully charged
• DC 5.5 × 2.1–2.5mm Connector: Inner positive (+), outer negative (−) polarity
• Multi-Protection Circuit: Overvoltage, overcurrent, overload, and short-circuit protection built in
• Compact & Portable: Lightweight cable design — toss it in your bag or keep it in the car
• Wide Compatibility: Fits car and household cordless vacuum cleaners and other devices with a matching DC barrel port
• Durable ABS Plastic Construction: Built to withstand everyday use

Specifications

What's in the Box

• 1 × 8.4V USB Lithium Battery Charger Cable

Notes

• Colors may vary slightly from images due to monitor brightness and lighting conditions.
• Please allow for minor measurement tolerances.
• Confirm your device's DC port size and battery voltage before purchasing.

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For more information on lithium battery safety and handling, visit the U.S. Consumer Product Safety Commission – Lithium Battery Safety.

Frequently Asked Questions

Q: What devices is this 8.4V USB lithium battery charger compatible with?

A: 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.

Q: Can I use this charger with a power bank or laptop USB port?

A: 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.

Q: How do I know when my device is fully charged?

A: The built-in LED indicator makes it simple: a red light means charging is in progress, and a green light means the battery is fully charged. Once you see green, it's safe to disconnect.

Q: Is it safe to leave this charger connected overnight?

A: 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.