Battery location

First made a major error, the boat is a 1978 not the other year
Why so many batteries. Two are for 24 volt trolling motor, one for cranking, bilge pump, live bait tank, navigation lights etc. and one for VHF, GPS and depth recorder/ fish finder. In this area (fresh water) we trolling at one to two MPH for Stripers using the trolling motor.
Have one concern. The storage area infront of the motor well is not sealed off from the gas tank. Come to think of it the current battery location is not sealed off from the gas tank; there is about four feet seperating the two.
Wow!! youy guys are good. Thank you for your input.
Warner