How to Replace a Laptop AC Adapter

Power down your laptop, and turn it over.

Locate the battery compartment on the underside, and write down the power settings, which are noted in watts or volts of direct current and amps. Laptop wattages vary but are commonly between 65 and 120. On some laptops, you may find an information sticker that says "19V DC -- 3.8A," which means it requires 19 volts of direct current with a 3.8 amp rating. If your computer notes volts and amps but not watts, multiply the volts by the amps to get the approximate wattage, which in the case above is 72.

Locate the computer's make and model number, which are also likely to be on the underside of your computer.

Visit an electronics retailer, either in person or online, and type your computer's make and model into the search box, or give these details to the clerk on duty, and ask for a compatible adapter.

Navigate through the site's controls to find Laptop AC Adapter for your laptop model if you are searching online. They may be under "Accessories."

Locate the voltage and amperage on the charger recommended by the clerk or website. If you are searching online, this may be under "Specifications." Make sure the numbers are approximately equal to your battery's requirements. A small amount lower will not hurt your laptop, but too much power will.

Check the jack on the charger that will connect to the computer to make sure it is physically compatible with your laptop's DC input jack. Universal chargers may come with several adapter heads. If you are shopping online, the technical specifications will list the compatible laptop models.

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