Hi Seevee,
Battery lifecycle costing is oh, SO much complex than simple $/AH considerations. And while the simplistic answer to your question of
Quote:
Is it prime time for lithium? LifePO? How about the Firefly Oasis? Other thoughts?
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is to simply replace yours with like kind, and be done with it, I presume by your inquiry you have some desire to upgrade your existing electrical system. And THAT's a way, WAY more complex issue than "what kind of battery should I buy?" And in my opinion, more complex an issue that can be properly addressed in an open forum such as this.
If you're interested in battery "system" upgrades (and it's truly a SYSTEM, as many posters have already alluded to), suggest you start by looking at this interesting lifecycle battery comparison tool:
Comparing marine batteries (Gel, Absorbed Glass Mat (AGM), flooded lead acid)
The data's kind of old (particularly the retail costs of the various marine batteries in Vonwentzel's database), but those are easily modified for present day costs in your local area.
And then, of course, there are a myriad of other learning tools on the WWW, such as
https://www.pysystems.ca/,
https://marinehowto.com/, and many others.
Regards,
Pete