long story short but all 3 of my current batteries are bad. They are the batteries that came with the boat a few years ago. The cranking battery is an Interstate MT-34 (700 CCA) and the other two that are wired together are Exide Orbital deep cycle marine (750 CCA). They are all wired to a perko switch and I usually run it on "all"
My question is what is the best bang for my buck? Also, should I go with all the same deep cycle marine battery? Any and all advice is greatly appreciated as I am no battery guru. I have a WS Syn 4 running two rev 10s, and two other amps running a sub and my in boats. Also, some LEDs throughout. My boat is a 99 SAN with the GT40, just FYi.