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Yes, the Delco batteries were lead acid in a glass jar, later in a rubber one.. You would charge them to a rolling boil. One cell has a float ball in it to indicate charge

The capacity ranged from 157Ah to as much as 533A/h. Depending on which style you bought.

The smallest set of 16 weighed 670lbs and cost $163.00 in 1941

The bigger set weighed 1712lbs and cost $399 in 1941. Folks were still buying them then.

You could buy the lead negative and positive group plates seperately to rebuild them.

I've seen a battery bank that still holds a charge, very rare now, as glass breaks easily. I have one large one for display, and it weighs a good 20lbs dry.

Edison batteries (alkaline) lasted even longer, and I had a set of those several years ago, that still held a charge.