Just ordered 2 12 v 10 ah lifepo4 from Dakota Lithium. Along with the charger. At half the weight, the enclosure can deal with and last a little longer.
Thinking about building a trailer anyway and will locate both batteries there along with the charger and tool box.
While I don't know this beyond a doubt, and told differently by an employee of advanced auto, but I am pretty f***ing sure you can use a standard car battery charger on a li-ion battery meant to be installed in a bike or atv for starting purposes. My thought is that the vehicle doesn't know crap about what battery is installed and many are very likely manufactured before a li-ion battery was even a thing. So by default the manufacturer MUST AND I MEAN MUST
install a protection circuit on-board to protect their battery. Especially when it says it works in everything and doesn't require crap to adapt it.
This goes with any and every possible drop-in replacement battery you will find online. If a listing at all hints it needs a protection board or some odd thing to "charge safely" then drop them like a mother f***ing melon. Either they haven't got a clue what they are selling (which means stay away from them since they'll sell you anything even if it isn't appropriate for you) or are selling something that literally needs a special charge circuit, in which case it's the farthest thing from a drop-in unit.
So if I see a battery like that at autozone or advance, or anywhere for that matter, and it's advertised as being capable of just replacing a lead-acid with no additional components then it should be fine to charge on a regular car battery charger because that's exactly what's in the f***ing car already, a car battery charger!!
That's how it charges it without blowing up, so if that part or the car charges a li-ion battery without the battery blowing up, then why shouldn't the the charger work without the rest of the car attached? You get what I'm saying?
When I asked the clerk why a motorcycle can charge the battery without problems but the same basic thing plugged into a wall can't he told me he "didn't know but the battery still needed a special charger to be charged outside the bike."
I set the battery down and said "no thanks because you don't seem to know what you are talking about." I probably would have bought it but I remember how turned off I get from talking to people who bring up questionable answers, it's like you either do know or don't, if you seem to be swaying with some popular opinion or idea I get really sick because I can't trust anything they are producing at that point.
I haven't asked this question before or after that point, but if anyone has an idea about what I'm asking there please chime in. I really can't wrap my head around a li-ion starter battery that can be safely used in ANY vehicle but somehow needs a magic charger once outside of said vehicle..