can my plugged in 5 be damaged by a power outage

I charged once a week overnight, even though I know it's at 100% within the hour I plug it in. So it was just sitting there, fully charged but plugged in when out of the blue there was a power outage in the neighborhood. Obviously, it made a noise indicating no power to it via the cord and it works just fine.

I was just wondering if that could cause any underlining issues soon?