Well, this is something that I actually used. I have a robo vacuum. I was preparing my home for some guests once, when I saw that the vacuum wasn’t charged fully (because it was mispositioned on its base). I put it to the right spot, let it charge for half an hour, started it and left to buy groceries.
At the store, I checked the app where I have my apartment mapped by the vacuum that shows its route and cleaning progress. And I saw that with the current charge, it will have to go back, charge and continue. So I set it from “max” power to “normal”, to let it at least finish the job.
It is a cool and useful thing