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So I was trying to kill a Java process the other day. I opened htop and looked for Java. This was the first time I really used htop so I figured I would set it up in a way I would like. I added the battery, processor temperature and fan RPM meter. To test the battery meter, I removed the charger and the battery showed Running on battery. Suddenly the CPU temperature meter went red and showed 129.0 C! I was really surprised because the temperature was at ~60 C before.

TL;DR

My computers CPU temperature more than doubles when I remove the charger. Is this normal? Why is this happening? Should I try to fix it? If so how would I fix it?

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2 Answers 2

Reset to default
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You must to reset the System Management Controller (SMC) on your Mac:

Steps:

Intel-based

  1. Shut down the computer.
  2. Disconnect the MagSafe power adapter from the computer if it's connected.
  3. Remove the battery.
  4. Press and hold the power button for five seconds.
  5. Release the power button.
  6. Reconnect the battery and MagSafe power adapter.
  7. Press the power button to turn on the computer.

Complete Documentation Here

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Addendum to Fransisco Tapia's answer, as many modern Macs don't have a removable battery...

To reset the SMC on a Mac without a removable battery.

  1. Shut down the computer.
  2. Plug in the MagSafe or USB-C power adapter to a power source and to your computer.
  3. On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
  4. Release all the keys and the power button at the same time.
  5. Press the power button to turn on the computer.

On MagSafe power adapters, the LED might change states or temporarily turn off when you reset the SMC.

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