I have a 2005 C-310 with two (class 4-D) batteries in a port side locker. Guessing the batts are 80 lbs ea. My boat does not have a list. Wonder if it was a design change to move to two bigger batteries vs. 4 smaller batteries.
Our 310 with 5 batteries has a small list. I occasionally notice it at the dock but never think about it while sailing. The Admiral has never mentioned it so I don’t think it is over a few degrees. Storing that very heavy full size table in the aft starboard berth slot probably helps. My batteries are as close to the centerline as possible. I keep my tools and spares in the starboard locker under the settee.