Phone batteries deteriorate over time, which can eventually lead to performance issues and crashes. To deal with problem, the software was designed to limit the phones capabilities the further the battery deteriorated. That's the excuses that Apple chose to go with which is somewhat true. However they definitely limit the older phones more than necessary, just to be on the safe side and at the same time force users to buy a new phone.

If you've got an older iPhone that seems to run a lot slower than it used to, I'd suggest just replacing the battery. If what Apple reported is true, that should fix the problem. There are enough tutorials online for all the available models.

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