Re: Batteries, Starting battery for Ourboards
These days marine starting and regular old car batteries are identical. The ONLY difference is the sticker on the front, and a larger price tag. At point some time way back in the old days, it was thought marine batteries were constructed to absorb vibration better. That may have been true at one point, makes no difference now.
I've run deep cycles as starting batteries before. On a 75, a deep cycle will crank that over without issue, and depending on how you use the battery, a deep cycle might suit your needs better. Its also a common misconception that you will damage a deep cycle by using it as a starter battery. You won't.
(got a deep cycle on my pontoon as the starting battery, with a 65hp 4 stroke on the back. It sees a fair amount of floating time with the stereo on. I'm going on my 6th year on that battery.)