Take a look at this site. Basically they sell rechargeable battery-warmed coffee cups.
https://ember.com/$150 for a *expletive deleted*ing 14 ounce cup with a battery warmer?
"Ember’s patented technology allows you to experience precision temperature control in your everyday life, with the vision to transform how the world eats, drinks, and lives, empowering you to experience your world without limits."
You know, since I was just a youngster I've thought that if someone could make a precision temperature controlled mug and could do it for less than $1,000 it would absolutely revolutionize my life.
My God, what a wonderful world in which we live.