Under certain conditions, in particular when the Lithium ION battery in a MacBook or MacBook Pro has reached extreme temperatures, the battery can display symptoms of what is called thermal runaway. This causes the cell to ‘swell up’. The first signal that you may be experiencing thermal runaway is that the trackpad may start to respond erratically. The next stage is that the trackpad click mechanism starts to feel tighter and stiffer. If you are having these symptoms it is definitely time to have the Lithium ION battery replaced. We have also seen this happen to the older white MacBook unibody models and on some 15″ MacBook Pro models.
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