AGM vs lead acid marine batteries

[trueblue2]

Thanks for your replies. My boat already has two cranking batteries that provide all power for boat and accessories. Decided to replace both with AGMs and use the existing good LA as a backup for truck. Bought NAPA Automotive AGMs. Can’t be any worse than the LAs. I do think it’s not good to mix battery types. I think I slept thru the battery subjects, too!