I dunno, in places like cell manufacturing, it is a climate and product controlled enviroment so that level of tolerance would be expected. Just remember the amount of cells these firms are producing for other markets, if they start to have to dump x% of cells because they fall below the minimum requirement, unit costs go up.
I mean, it is a chemical make-up, and Duracell make cells to a certain level, and if they don't reach it they don't get to the market, same for anything else, imagine shampoo coming out with a too strong a mix and burning peoples heads, same difference or philosophy.
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