I have a NEMA 14-50 and am getting the HPWC. My Model S currently charges at a full 40 amps and 29-30 rated miles/hour. Generally, I plug in at night and, while the Model S could charge for 10+ hours, it unsually tops off in a couple of hours and shuts off. Tonight I'm doing a Max Range charge so I limited the amperage to 20 Amps so it spends less time at 100% in the wee hours of the morning (I know the couple of hours is probably insignificant). However for everyday charging is it any better for the batteries to charge 6 hours at 20 amps rather than 3 hours at 40 amps? Less heat and load? Or is it better for the batteries, within the Model S limits, to charge at the highest current available and spend less time charging?