Why is my phone battery dropping quickly then going back up after a restart?

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Android Central Question

've noticed that my phone rarely just begins dropping quickly, around 1% a second, but when I restart it, the battery jumps up to around 20% to 25%, often acting like it hadn't just dropped to 0% in a matter of seconds. It makes no sense why it seems to be happening at all, but it just happens out of nowhere constantly.
 
I see similar behaviour in an aging iPhone. I take it to be a tired battery, a faulty battery chip, some piece of rum software, or just a problem with the entire universe.