This is an extensive website with entertaining comments section also
https://batteryuniversity.com/learn/...tery_knowledge
I did not know the original lead acid batteries with wood cases and rubber separators apparently had long lifespan. There’s some hypothesis that carbon particles from the rubber may have lengthened the life. Someone may know but apparently they are not saying. I’m not saying there is a conspiracy.
I do not work for Cadex or promote their products.