Time for my confession.
I was a 1st year apprentice 39 years ago, as a 1st year apprentice I was sent with the “battery” man for the day, we went to his workshop which is about the size of a double garage where once a week or so he would get a sort of sit on battery driven road / floor sweeper in to give a battery service to.
This consisted of scraping of the white furry stuff from the hundred odd terminals on the battery bank, then check and top up the levels.
Well anyway, It was my first time on this job (my defence), we both went to the workshop, sweeper waiting outside, he opened up and drove the sweeper in, lifted the lid on it showed me the mass of furry terminals, told me he was away for a shit with the Sun newspaper under his arm and would be back in an 30 minutes and I was to get battery cleaning. My ppe consisted of my overalls nowt else, I looked about to see what I could use to clean the fur off with, ahh a wire brush, perfect, mmm, these batteries are about 6” square with copper bars between them, when I started brushing a wee bit of sparking occurred, but they were cleaning up a treat.
Well 5 mins into my excellent cleaning job, boom, felt my face wet, no idea what had happened, but fortunately there was a sink in the shop so I washed my face, and had a look at what had happened. I was surprised to be able to see the plate tops on one of the cells, looked about the shop and abviously by design the top had blown neatly off in two halves on one of the many cells, so I gathered them up and clicked them back onto the cell top. Continued my cleaning with a cable tie end, which was not nearly as effective. My tradesman man came back and was well impressed with how clean I had got the battery bank.
Fast forward 3 weeks when my overalls came back from the wash, and I couldn’t work out why they were full of holes, took a wee while to twig the events of 3 weeks previous and how acid effects cotton overalls.
Oh how we laughed.