I have a Macbook Pro (Retina, 13-inch, Early 2015).

As it is slowly aging, I'm starting to consider leaving it continuously powered on.

Currently it stays most of the day powered on, for about the past six months.

Recently I noticed that its bottom is slightly bent. I have used it carefully through all of its life, taking good care not to over expose it to high temperatures.

Does leaving it continuously powered on entail any risk of catastrophic explosion, or further bending?

  • Are you sure the bending isn't the result of an aging battery?
    – nohillside
    Jul 16, 2019 at 20:28
  • Hmmm. Because my cousin has, or had, a contemporary 15-inch Macbook Pro (Retina), his has been bent for years, and he is a physicist instead of a computer scientist. That's the reason I thought the cause would have been a thermal exposition.
    – 146438
    Jul 16, 2019 at 21:45
  • @uprego You need to have your battery checked and replaced - don't wait with it. It has nothing to do with it the case expanding because you're overusing the fans. It has to do with a defective battery that swells up, and potentially could lead to a dangerous situation if left unattended.
    – jksoegaard
    Jul 16, 2019 at 22:02
  • It's on its way now. :)
    – 146438
    Jul 26, 2019 at 19:28
  • I just received the machine unbent and supposedly there’s a new battery now. :)
    – 146438
    Aug 16, 2019 at 7:55

1 Answer 1


This is in almost all cases caused by the battery swelling up and thus "bending" the case. The case expansion cannot in itself be caused by "overuse of fans".

You need to have your battery checked and replaced - don't wait with it. It is caused by a defective battery that swells up, and potentially could lead to a dangerous situation (such as causing a fire) if left unattended. This can happen not only when the computer is plugged in and powered - but also when the computer is turned off and not powered by an external power source!

Remember that the battery is a wearing part, and yours is probably 4+ years by now.

  • 3
    and by dangerous situation we mean the possibility of fire or in some cases explosion. Not trying to scare you but I would have this checked NOW Jul 16, 2019 at 22:49
  • Alright, alright, I mean, I thought the case expansion was caused by excessive temperature on the battery, not because overusing fans. So what should I do? Bring the laptop to the Apple Store (I live in a big city)? Once replacing the battery, what should I do in order to repair the bent case?
    – 146438
    Jul 17, 2019 at 10:30
  • @uprego It's not in general caused by excessive temperature on the battery, no. The batteries are specced to be able to withstand the temperatures found inside the MacBook Pro - even if you run the fans all the time. The most common causes of swelling are really mechanical damage (i.e. for example if you drop or bump the laptop, but could also be during shipping/manufacturing), faulty charging electronics (i.e. overcharging), very intensive use of the battery (i.e. fully discharging it often) and simply old age. I would say that you shouldn't expect laptop batteries to last more than 3 years
    – jksoegaard
    Jul 17, 2019 at 10:51
  • I.e. it's not that laptop batteries cannot last more than 3 years, but after that point, I wouldn't be surprised if something happened and it had to be replaced. Also ofcourse, temperature can play a part in it too - but then it would usually be from outside sources - i.e. if you leave the laptop in the sun for hours.
    – jksoegaard
    Jul 17, 2019 at 10:52
  • I'll ask hardware technical support folk, but I suspect of the fact contemporary macOS has not protested about the battery aging, unlike iOS does as soon as iOS version 12. 🤔
    – 146438
    Jul 17, 2019 at 12:22

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