Do you have a way of loading these batteries to see what kind of load they can power and for how long before voltage drops?
Trying to determine battery health/ remaining capacity, by how much a newly acquired used battery accepts at a certain voltage from a certain resting voltage when attained, well there are no trends and no tendencies to compare to.
In my experience a well rested battery behaves differently after a good discharge followed by a prompt and full recharge.
See how the long the battery that got hot, powers a 6.6 amp load before voltage drops to 12.2v.
Can't do 6.6? Guess what, few can. Just see what it can power for how long before voltage drops to XX.XXv, and we can guess as to what degree peukert is reducing battery capacity, if any.
Find and measure a load.
I could go around to gas stations with a full tank and try and determine the exact level at which point the pumps shut themselves off, an dperhaps try to infer the MPGS from gas station to gas station, but why?
Find and measure a load and apply it for an amount of time. 6.6 amps would be ideal load on a 132AH rated battery, and if it powers it for 20 hours before voltage drops to 10.5 v, then pat yourself on the back for a wise purchase. If it hits 10.5v in 6 hours, then shake your fist at the sky and curse the battery gods.
All we really can know at this point, is the battery which got hot, is likely no Steen....king bueno.
But load the SOB.
My screwy 31 got all hot and bothered on the bottom of one cell 2 years ago. Yet it still lives on with a resting voltage that can remain above 12.82 for a week after recharging.
When loaded, it reveals its less than healthy state.
If resting voltage were an indicator of health, well I got a flooded group 31 that can pass with flying colors, until it has to power a load.
