HP K0Q39AA

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.

Orders are processed within 2 business days, which includes verification, packing, and dispatch. Shipping costs are calculated at checkout based on destination, total weight, and selected speed. Free shipping applies to carts over $100 (excluding heavyweight items). All available options and final pricing are clearly shown before payment so you can choose the service that best fits your needs.

Deliveries are handled by major carriers such as USPS, UPS, and FedEx. Estimated delivery times are displayed at checkout and may vary depending on service level and location. Please note that these are estimates and can be affected by weather, holidays, or carrier volume. Once your order ships, you’ll receive a tracking number for real-time updates from pickup to final delivery.

Providing an accurate shipping address helps prevent delays, and changes may be limited once the order has been dispatched. P.O. boxes are supported only when permitted by the selected carrier. Packaging and handoff are optimized to protect items during transit, though oversized or high-weight products may require special handling. All shipping methods and any related constraints are clearly shown during checkout.

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Returns are accepted within 30 days of delivery. Items must be unused, in the same condition received, with tags, manuals, accessories, and original, unaltered packaging. Any item kept will be deducted from the refund. Start a return by sending us an email. Items sent back without approval may be refused or returned to the sender.

Some items are not returnable: opened TVs/combos/monitors 37″+, opened computers or software, electronic downloads, opened consumables (film, paper, bulbs, media, ink), custom or modified computers, special-order or “nonreturnable” items, submerged underwater gear, and opened educational media.

After inspection, refunds are issued to the original payment method; allow 5–7 business days for the credit to post. Shipping, handling, customs duties, and import taxes are nonrefundable. If an item is used, incomplete, or not in original condition, a 30% restocking fee may apply. Direct exchanges are not offered; purchase the replacement and return the original for a refund.

We act solely as a reseller. Any product warranty is provided and administered by the manufacturer, not by our store. That means eligibility, coverage, and outcomes are determined by the manufacturer’s policy for each brand and model. Before purchasing, we recommend reviewing the warranty terms on the manufacturer’s website or in the product documentation to confirm what is covered and for how long.

If you need warranty service, please file the claim directly with the manufacturer. They may require proof of purchase, the product serial number, original packaging, photos, or basic troubleshooting. Some brands ask you to register the product or obtain a case number before shipping it for repair or replacement. We don’t submit or approve claims, but we can point you to the correct support links and contact details.

Keep your invoice and packaging in a safe place, and report any functional issues to the manufacturer as soon as they appear. If you’re unsure whether a problem is covered, the manufacturer’s support team can confirm next steps and timelines. While we cannot intervene in decisions or outcomes, we’re happy to provide purchase documentation or guidance so you can move through the warranty process smoothly.

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