Joe,
Am sure I will open Pandora's box with the following reply; opinions are what makes life interesting!
Have owned an Albin 30 for close to ten years and don't fully understand moving the batteries aft. Gave serious thought to moving batteries aft when I rebuilt the electrical system; new panel, A/C dock power, voltmeter, etc. Also recabled and installed a charger just forward of the hanging locker; in addition went to larger batteries to accomodate auto-pilot etc. Granted there is problem with the present installation due to the length of the cables and related deficiencies, however in my estimation the balance of the boat was of more importance. Considering the time the electrical system is in use vs. time under sail did it for me.
A friend, and fellow Ballad owner, has kept the same configuration with an additional battery for a refrigeration system. The 3rd battery is mounted just aft of the galley above the fuel tank. Certainly would think twice about this if the boat used gasoline vs. diesel.
Regards,
Dan Sullivan (Acqua di Vita)