Nope! Pulled off the bellypan to work on the motor mount - haven't put it back in yet.
I unplugged the charger this morning and then let the batteries sit for a while.
I measured the voltage of each battery.
These are the voltages of the charged, rested, non-heated batteries - temperature is 15℉ outside. Batteries 1-4 are in the truck/hatch, and batteries 5-6 are under the hood, where the radiator used to be.
I then drove 3.9 miles, and measured the voltage again.
Here is the battery number, then the voltage while charged and rested, then the voltage right after the 4 mile ride. The third column is what the voltage was about an hour and a half later.
1 12.93 V 12.48 V 12.68 V
2 12.86 V 12.38 V 12.60 V
3 12.74 V 12.19 V 12.43 V
4 12.77 V 12.18 V 12.45 V
5 12.89 V 12.32 V 12.64 V
6 13.01 V 12.51 V 12.78 V
Note that the voltages I listed are when the car isn't moving. (The batteries are NOT under load!) The batteries drop in voltage real fast while driving, especially accelerating or going uphill.
Looks like batteries 3 and 4 aren't doing as well. Maybe I need to individually charge these two after my next charge cycle.