A bulging laptop trackpad could signal a dangerous battery problem
If a laptop's trackpad starts pushing outward or the case looks swollen, users should stop using the device immediately since a swelling battery is often the cause and can pose a fire risk. In most cases, a professional battery replacement fixes the issue.
Most modern laptops keep their lithium-ion battery directly beneath the trackpad. These batteries are generally safe, but physical damage or overcharging can trigger internal chemical reactions that release gas and cause the battery to swell. Because of its position under the trackpad, a swollen battery pushes that component outward — sometimes hard enough to crack the glass covering it. This applies to Surface devices and MacBooks alike, and Apple has previously run replacement programs for MacBooks affected by swollen batteries.
A popped-out trackpad is typically a sign that the battery is reaching the end of its usable life. In the worst cases, a faulty battery can swell to the point of exploding or catching fire. There are other, unrelated reasons a trackpad might come loose, such as a detached internal screw or physical impact, but a battery issue should always be checked first as a precaution.
What to do if it happens
Anyone who notices their trackpad popping up or their laptop case bulging should turn the device off and unplug it right away. Taking the laptop to a repair professional is the recommended next step, since mishandling a swollen battery carries real fire risk. In most cases, once a new battery is installed, the trackpad snaps back into place. Repair costs vary — Apple, for instance, charges between $149 and $249 to replace a MacBook battery depending on the model, with higher costs if the trackpad itself was damaged. Devices still under warranty are often repaired for free.
To help prevent battery swelling, it's advisable to avoid leaving a laptop in extreme heat or direct sunlight for long periods, use only certified original chargers, and store an unused laptop at around 50 percent charge, powering it on every few months to check that it's still functioning properly.
