Just some quick researching.I do know that Advance Walmart, and many other batteries are made by GNB/Exide.
The different brands come in different quality of manufacture I know this from working 1 full year as a battery specialist at Advance many moons ago.I took care of all the batteries coming and going.I would charge pro-rated batteries and test them for resale etc.
I will testify that most of the name brand batteries Exide,Interstate,and Diehard passed recharge and storage for resale whereas most store brand did not.
This table here shows Exides top of the line conventional deep cycle battery.This would be a great battery for any marine application.
Size Model
[email protected] [email protected] [email protected] Dimensions
8DST8DDC400800120040020-3/41110-7/8200 Ah.
The last number shows the capacity or discharge rate 200Ah very good
Now Exides sealed marine battery isnt half these specs and probably twice the price. CCA 770 res cap 95
Now the difference is that the awesome battery mentioned first is a BEAST sized battery the sealed unit is much smaller.If you dont mind longer charge times then you will get longer running times but will have to have one of these beast batteries.So research a little and determine what size and recharge rate fits you best.
I have one of those Exide batteries got it used 3 yrs ago and use it in a camper and it is a big heavy sucker.