It has long bugged me that, with sealed batteries, we lost the ability to just dip in the hydrometer and get a good measure of state-of-charge.

There is voltage-v.-charge-v.-temperature data published which can be used with sealed batteries, but that data never seems to be at hand when needed. I wanted some sort of rule that I could keep in my head.

So ... came up with a rule-of-thumb. Please see 2nd paper at http://www.scorekeeper.com/jaguar/jaguar02.htm

Any suggestions, comments, criticisms are welcome, either here or by PM. Hope this is of value to someone.