re: Giving her a hard time
For what I paid for that shaver, the charger should shut itself off when the charging is done. The shaver is designed to sit in the charging stand when you're not using it. How many people are going to want to just lay it on the counter instead, or unplug and replug the charger in all the time?
You build consumer equipment for how it's GOING to be used, not for how you think it ought to be used.