HP 7.4mm to 4.5mm DC Dongle

Overview

The HP K0Q39AA is a DC adapter cable designed to connect older 7.4 mm HP power bricks to notebooks that require a 4.5 mm barrel jack for charging. This short dongle allows users to continue using their existing chargers with newer HP laptops such as the EliteBook 840 and ZBook 14, as well as compatible battery packs like the HP CO06XL Long Life Notebook Battery. Its compact length keeps workspaces tidy while providing enough flexibility to reach docking stations or external batteries.

Key features

• Enables compatibility between legacy 7.4 mm HP power adapters and devices with 4.5 mm DC input, reducing the need for multiple chargers.
• Durable molded connectors ensure a secure connection and resist wear from frequent plugging and unplugging.
• Compact and lightweight design makes it easy to carry in laptop sleeves or travel pouches, ideal for mobile professionals.
• Helps IT departments manage mixed fleets by minimizing charger inventory and simplifying power solutions.
• Supports consistent power delivery to maintain reliable charging performance across compatible devices.
• Backed by a one-year limited HP warranty for added peace of mind.

Key specs

• Input connector size: 7.4 mm barrel jack
• Output connector size: 4.5 mm barrel jack
• Cable length: short, designed for minimal desk clutter and flexible reach
• Compatible devices: HP EliteBook 840, HP ZBook 14, HP CO06XL Long Life Notebook Battery
• Warranty: one-year limited HP warranty

Connectivity and compatibility

This adapter bridges the gap between older HP power bricks and newer laptops or battery packs that use a smaller 4.5 mm charging port. It works seamlessly with popular HP business laptops and select battery models, making it a practical solution for users upgrading their devices without replacing their existing chargers.

Ideal uses and environments

The dongle is well suited for professionals who travel frequently between client sites or offices, as well as for classrooms and shared workspaces where multiple generations of HP laptops are in use. Its compact size and durable build make it a reliable accessory for daily commuting and busy office environments where power needs must be met without extra clutter.