Best advice I have here is listen to Hawkl. From what I've read here he knows his shiet.
All I will say is that with what I've dealt with the last 10 years as far as boat batteries is take them in in the fall and put them on a trickle charger and check the water (distilled) in the spring when you take them out. I am currently running a sealed and an unsealed battery I bought with the boat 5 years ago and they both hold a charge well. Buy decent and take care of them and they'll be good to you from what I've seen.
Thank you.
And here I thought all those years in the business was a waste!
Anyone with a hydrometer can verify state of charge or test how in-accurate their automatic charger is (EZ RED makes a nice, simple one).
A battery reading 1275-1300 is good for three months if away from heat above 70 degrees and direct sun and won't freeze above -15 nor sulfate internally.
If its a wet battery and its sealed, it will need monitored with a voltmeter or charger by OCV readings away from surface charge.
