Dual Batteries.....

Thanks for the information.... Looks like something I may do.

That's correct, it for a sound system and amplifier. I just don't want to be stranded in the middle of the lake with a dead battery after a day of enjoyment.

Thank you all for you input!!! I will look into a Perko.....

Thanks again!!!

I installed dual batteries in my 78 Ski Nautique but not in my 1995.
In the 78 I measured the battery box for exact size top and bottom and side to side.
Then I looked at batteries at the store, today Walmart or any parts store has selections available out front where you can walk up and look at them and measure.
I found two that would fit side by side in my existing box, each had about 500 cold cranking amps. I don't know if the 97 has an ice chest in the floor like my 95 does but that could be used as a battery location if needed. I wired them in sequence so Ground to Ground and Pos to Pos..
In my case I wanted more Cold cranking Amps and got it this way.
Wired like this both batteries charge at the same time.
A better way would be to buy one of the battery isolators that are available so you could choose what battery to run on or charge with a dial switch. This way one would always be charged and ready to use for those times when you forget the stereo is blasting till the battery dies.
Hope this helps.