What exactly counts as a full charge cycle on the iPhone?

Do you have to run it down to 0% or does it have to be at least just below 20%?

I have never run mine down ever, I charge mine overnight anytime it gets from roughly 10% to 30%

One full cycle is 100% down. If you go 20% down and 20% back up 5 times that is one cycle. You don't have to run it down all the way. In fact, it is better to charge in small increments because hot batteries don't last as long.

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