5V to 21V Boost Charging Cable – USB DC Adapter for Lithium

5V to 21V Boost Charging Cable – USB to DC Adapter for 21V Lithium Batteries

Keep your 21V lithium battery-powered tools running strong with this compact and reliable boost charging cable. Designed to step up a standard 5V USB input to 21V DC output, this cable is a practical replacement or spare for worn-out or damaged charging accessories. Available in a convenient 1-pack or 5-pack, it's ideal for workshops, garages, and job sites.

Key Features

• 5V to 21V Boost Conversion: Converts standard USB 5V input to 21V DC output — perfectly matched for 21V lithium battery charging.
• High-Quality Construction: Built from durable plastic and metal components for long-lasting, dependable use.
• Replacement Ready: A straightforward aftermarket replacement for damaged or aging charging cables — not original OEM.
• Two Length Options: Available in 50cm and 100cm lengths to suit different workspace setups.
• Standard USB Interface: Compatible with standard USB power sources for easy, no-fuss charging.
• Multi-Pack Value: Choose a single cable or a 5-pack to keep spares on hand wherever you need them.

Specifications

Package Includes

• 1 or 5 × Boost Charging Cable (lithium batteries not included)

Made in Mainland China.

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Note: Colors may vary slightly from images due to monitor settings. Please allow minor measurement deviations.

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Frequently Asked Questions

Q: What devices is this 5V to 21V boost cable compatible with?

A: This boost charging cable is specifically designed for use with 21V lithium battery packs, commonly found in cordless power tools and similar equipment. It converts a standard 5V USB power source to the 21V DC output required to charge those batteries.

Q: Is this an original manufacturer cable?

A: No — this is an aftermarket replacement cable, not an original OEM product. It is intended as a replacement for damaged or worn-out cables and is built from durable plastic and metal materials for reliable everyday use.

Q: What lengths are available and which should I choose?

A: The cable is available in 50cm and 100cm lengths. The 50cm option is great for compact workspaces or bench use, while the 100cm cable offers more flexibility when your USB power source is further away from your battery.

Production & Packaging Notice

To 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.