I have all of my electronics hooked to my starting battery. I have hard core overkill: Series 31 Sear DieHard Platinum AGM batteries....
I have to say that they are amazing....
I bought the best Marine cranking battery Auto Zone had..
So far so good...
I know....cheap way out but it has served me well...
Those Optima batteries are way over priced.
I have two in my boat. Going on 5 years now. $98 US eachYou right Optima over priced too...
Maybe I will just get another AC Delco M27MF, never had any real problem with them....and I can buy them here in my home town for $158.00. Its also a Dual Purpose.
Pro
Dont buy one of those Maxx batteries from Walmart. Wont hold a charge, I went through 2 and got my money back.