Re: 4D battery question.
A lot of auto supply places will test a battery for you. And HF sells some cheap testers (not just a voltage meter, but a resistive load tester, and it's ridonculously cheap, but works really well; it's probably the same unit they'll check out to you at the auto parts store or WalMart. Close enough for our work, and it can let you know how the desulfation process is going.
I suspect you may have what some call hybrid deep cycles; they're common in marine use. That's what I've had in my van (AGMs) for about 10 years now. I keep them on a trickle charge at home with a smart charger (it charges in stages), and as you can see it keeps them going forever.
That last bit of charging is the hardest; if you look at the curve of how a battery accepts charge you can see you get a lot in quickly, then it takes a long time. So on the road I never get up around 12.7 unless I'm parked for a couple of days on shore power or solar; the engine rarely gets me a full charge. And it will be difficult to get that optimum without a smart charger.
Rob
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2001 Ford E250 Sportsmobile with Salem-Kroger 4x4 conversion
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