When I worked on a battery assembly line in the early 1960's, we would build about 2000 Group 1 6V batteries a day. My job was melting lead into molds to make the posts as the batteries moved slowly past my work station on a conveyor. A helper on the other side of the line would use a pair of channel lock pliers to remove the molds, dip them in a bucket of soapy water to cool them a little, and place the molds on the next battery. Talk about boring work! That's when I decided any kind of manufacturing work was not something I'd want to do for a career!
Jerry