Battery location

Have a 1987, V 20 Cutty Cabin and want to move the batteries forward. The batteries are all located under the motor well, which to me is the worst possible location. Why! if excess water gets in the boat it is going to the stern where it can short out the batteries. No battery power means no radio, bilge pump lights, ETC. Looking for suggestions as to the best location. There are four size 32 batteries. After removing the GAS tank (cut out a lot of foam) and installing another one have lots of room ahead of new tank. However, not sure if I can isolate the gas tank and possible fumes from the batteries. Believe there would be to much summer heat in the cabin. HELP!!