Bama - As I scanned this thread, I kept saying to myself, "I wonder how old his batteries are?". And then came across your acid in the case post. Your on the right track on replacing the battery. You would be wise to make sure you get a RV/Marine battery ---> i.e. wing nut terminals on the top posts. Generally speaking, you should get a couple of good solid hours of play from this new battery. If you want more play time add another battery. I'd suggest a group 29 from costco or walmart which will set you back 80 bucks. I'd also recommend looking at a promarnier charger which can be had for 150 bucks. This will automatically tender your batteries. You just plug it in each time your done using the boat.

If you, or anyone else reading this has a 6 volt drop on audio startup, you have a battery issue--not an alternator issue. Good luck on your upgrades. Let us know how much play time you achieved on your new BAT :>

-Brian
Exile Audio