I did one years ago, (stupid kid I was back then. Dumb old man I am now I suppose, but not so dumb)
I cant remember if I even used what little lead I got from it. What I do remember is that after all the work I had to go through to get into the case without getting acid burns (washing it out isn't enough in my book, I've seen what sulfuric acid can do) the plates ended up being a grid like mesh with powder in them. The powder was useless, and the grids from all the cells probably didn't amass more than a pound or two of usable lead. (Might have been more like I said it was years ago)
I can say even this many years later, I still wouldn't go through that again for the meager pickings I got unless it was literally the last source for usable shot I had (note I said shot, not lead.. I will shoot balls of other materials before I go through that again!)