I might have missed an event or 2, but my battery temp seems to stay @ 6 bars 24/7/360 in Houston.
We drive very conservatively and M/Kwh = 4.9 since new & routinely 5.0+ per trip (car dash data)
I exclusively charge @ 120V. (well a few times 5? @ 220v for an hour or so, Never: LBW, turtle or...