Sure, there are some research projects for that, but note the wildly different cost: charging a little different doesn't degrade the car's battery. All it takes

Sure, there are some research projects for that, but note the wildly different cost: charging a little different doesn't degrade the car's battery. All it takes is an Internet connection, a good prediction of how much charge the driver will need, and a micropayment of some kind. That's a no-brainer compared to paying the owner for shortening the life of the battery.