Chapter 19

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Every time I go to the store for batteries, I find hundreds of AA's and AAA's in stock, and only one peg of 9V two-packs.

Every electric guitar effect box uses 9V batteries, as do all smoke alarms that use batteries. There are probably many domiciles where the 9V battery is the only format replaceable battery that they have. And every indoor space has a smoke alarm, and every person lives in an indoor space.

So how come 9V batteries are such a low-velocity sales item?