+1 jbncdab, it was really interesting seeing inside the battery. Now even I feel I could clean my auto batteries when required. Thanks Snow!!!!
Edited to note: Argh, just as well I feel I can clean them. I happened to glance at a batt while changing carts and yep, the threads are blackened. Thanks again Snow, very timely video!
Edited again to note: well that was pretty straight forward. I did find though, that loosening the black gunk in the battery threads before brushing with vodka worked better for me - perhaps it was a soft toothbrush.