> "- Battery would last several days on a single charge. I had totally forgotten that that used to be the case."
Several days? Surely you meant weeks? Unless you spent an hour or two calling on the phone every day, of course.
I get 5-10 days out of my iPhone depending on desire for leisure. In the "dumb" era the number was about 2-3 weeks, even when I was young and always texting throughout the day.