I’ve had the tumbler since October. First and most importantly the charge does not last 3 hours. No where near 3hrs. I have the mug as well and that charge only lasts an hour but it’s really not a problem because it has a car charger so my coffee stays hot no matter how long it takes me to drink it. The tumbler does not have the option to charge in the car so it’s pretty much useless. If I wanted to guzzle down my coffee I’d just leave it in the cup it comes in. Ember will there be a car charger for the tumbler?