I was home on leave and all my friends were either working or in college so I took a temp job and was sent to a car battery manufacturing plant. My job was to take batteries off the belt, pallitize them and move them to the warehouse. Me and another guy took turns driving the pallets to the warehouse. The morning began and black batteries came down the line. A machine applied a green Excide sticker to the casing, women with large kangaroo type pouched aprons would pull out green caps and attatch them to the battery cells. Next, the battery was inserted into an appropriate carboard box. Then a couple workers took a bladder of acid, clear tubing and an instruction sheet provided by the company that has ordered that brand of battery and placed them in the box. The machine sealed the box and I did my thing. After morning break, during which the mechanics changed out the sticker rolls, the women would rotate their aprons 90 deg around their body and start putting red caps on the next brand of battery. After lunch, the sticker machine was replaced with a spray stencil and DieHard was screened on the side. The women afixxed black caps to those. It was the same battery and acid - the only difference was going to be the retail price. So, the OP's experience doesn't surprise me in the least.