Join Date: Feb 2010
Location: Narragansett Bay
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Re: Any particular brands of AGM batteries to avoid?
It will be harder than you think. Most batteries are just rebranded versions from the same factory. In the case of WM, I believe most (maybe not all) of their AGMs are from East Penn, which is a quality manufacturer. In any event, the source is what you need to know, not the retailer.
If you are switching chemistries, be sure you switch charging profiles too. AGMs are good technology, as they can't leak and will accept a ton of charge, pretty quickly. That's an advantage, when charging via a generator or high capacity alternator. On the other hand, they can burn out an alternator, if it isn't properly temperature limited. Most stock alts are not. AGMs also want to return to 100% state of charge frequently for longevity. If you oversize the bank, you can get away with age degradation longer, but that's expensive too.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.