The failing autofills are an issue on the back burner now. It does not even come up with our factory tech.
The truth of it is that there does not appear to be a correlation between low voltage readings, failed autofills, corroded terminals, or which battery. It seems to be random.
Our tech told me he does not care about voltage readings, just batteries that are hot when they are charging. We are taking readings of that, too. Most are 80-90° when charging. The hot ones are 130-140°.
I have self-studied deep cycle batteries for a number of years, starting when I put together a solar electric system for a boat dock.
The general axiom has always been that the closer a 12-volt battery gets to 12.0 volts at full charge, the closer it is to being toast. I have emails from "battery people" to that affect.
In the last week I have visited a half-dozen websites tutoring on solar systems, RVs, golf carts, etc., and most of them agree with that. Most of them have tables like this:
State of Charge Voltage
100% 12.7
75% 12.4
50% 12.2
25% 12.0
Discharged 11.9
Or, here is 11.9 on another one:
20% (Cells die soon at this point. Bye-bye battery.) 11.80-12.00
and here's another one:
Discharged 11.90
But, both E Z Go and US Battery have sent me their tables. I won't post it all, but they are saying 11.9 is:
40% 11.96
So, figure it out for yourself . . . the battle I will be up against.
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