AC adapter HP L41423-001 120W 4.5mm — replacement power supply for laptops

AC adapter HP L41423-001 120W 4.5mm is an external replacement power supply designed to provide stable 120-watt output for compatible HP laptops with a 4.5 mm barrel connector. This adapter supplies the necessary power to charge the battery and operate the laptop during normal use. Built for single-voltage mains input and with a compact rectangular adapter brick and an integrated cable, it is suitable as a home or office replacement, for repair shops, or as a spare for travel.

Advantages

This 120W AC adapter delivers consistent power output to support charging and system operation under typical loads, reducing the risk of unexpected shutdowns. The 4.5 mm barrel connector provides a secure physical fit for compatible laptop DC ports. The adapter’s compact form factor and detachable mains cable make it easy to store and carry. Built to meet common safety and thermal standards, it includes overcurrent and short-circuit protection to help protect both the adapter and the connected laptop.

Suitable for

• Replacing a lost or damaged original HP adapter with a 4.5 mm barrel plug
• Using as a secondary adapter at home or in the office
• Providing power during repairs or diagnostics in service environments
• Keeping as a spare for travel or field work

Key specifications

• Output power: 120 W
• DC connector type: 4.5 mm barrel
• Output voltage/current: suitable for laptops requiring 120W adapters (matches required device input)
• Input: single-phase AC mains (region-dependent cord)
• Form factor: external rectangular adapter brick with attached DC cable
• Protections: overcurrent and short-circuit protection; thermal regulation

How to use

Ensure the laptop model accepts a 4.5 mm barrel connector and requires a 120W adapter. Connect the mains cable to the adapter and plug the adapter into a compatible wall outlet. Insert the 4.5 mm barrel plug into the laptop’s DC input until it seats firmly. When connected, verify that the laptop indicates charging or external power status. Disconnect by removing the barrel plug first and then unplugging the mains cable from the wall outlet. Allow the adapter to cool before storing if it has been used continuously for extended periods.

Usage recommendations

Use the adapter only with compatible HP laptops that require 120W power and a 4.5 mm barrel connector. Avoid exposing the adapter to moisture, extreme temperatures, or physical impact. Do not attempt to open or modify the adapter; repairs should be performed by qualified technicians. For long-term reliability, use a properly grounded outlet and avoid using extension cords or power strips with known faults.