Lead acid battery failure examined

Lead acid battery failure examined
Looking into a sulphated lead acid battery

Had some sulphated lead acid batteries that I was going to trade in, so I figured that I may as well get my moneys worth and see how they are made, as well as what was going on in side.
I got out my saws all and carefully cut off the top of two different brands.
It looks like the + terminal is susceptible to the plates corroding right through, and the sulphation can be so severe that it warps the plates until they short, and can lift the big buss bars to the point where they break off.
Not something that will recover very well, so we gave up on the rest and junked them all.