Dear David P,
Lately my iPhone 5s has been dying quicker than it used to. On a whim, I decided to Google the problem and found your site. I have just finished doing all the things you suggest and have high hopes that they will help.
A few I knew about but not most of them.
Whether or not they work, I want to thank you very much for posting them and helping those of us who are not former Apple employees or tech experts.
What a “Mitzvah” you are doing.
Thanks and Happy New Year!
Susan K