In some cases, as with older MacBooks, it’s relatively easy to disassemble the case and remove the battery. However, if the device is still functional and you need to copy data off or let a final backup run, try to put it in a place where it’s less likely to cause problems-on a concrete, stone, or tile surface, for instance, and preferably outside as long as it’s not wet, hot, or in the sun. Continued charging or use could lead to a fire or explosion. When you discover a bulging battery, unplug the device immediately and turn it off as soon as you can. With an iPhone or iPad, a swollen battery is usually obvious because it starts to warp the case and can even crack the screen-it all depends on where the swelling takes place and what part of the device gives way first. With Mac laptops, a variety of problems-some rather subtle-can indicate that the internal battery is swelling, including the screen not closing properly, a gap between the upper and lower parts of the case, a failure to sit perfectly flat, problems clicking the trackpad, or keyboard keys malfunctioning. Additionally, manufacturing errors or damage to the membranes that separate the internal layers of the battery can also lead to swelling. As lithium-ion batteries age, the chemical reactions that produce power no longer complete fully, resulting in the creation of gasses that can cause the battery to swell. A bulging battery is a Very Bad Thing and must be dealt with immediately because it could catch fire or even explode. We’ve been seeing a spate of bulging batteries of late, both in Mac laptops and iPhones.
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