I had this done recently, it did not seem to help (or hurt) the car. Neither did the new charger. It did however leave the car with a pungent and strong stink of greasy shop. And while that has aired out, I also think that it marked the end of my new car smell. Which is unfortunate and disappointing.
50-55+ miles spring/summer (no climate control), 45-50 summer (AC on Eco), ~30 winter (heater running)
The electric car will win one day, not because of global warming or enviro-anything, but because it is simply a superior driving and ownership experience. You read it here first.