The other day I was thinking about 9V batteries. I was wondering about their shape, and why are they a different shape than other batteries such as a C or D cell. Then two things occurred to me: First, the shape of a nine volt is not square on the bottom — it is a rectangle with a ratio of about 2 across by 3 down. You could fit six cylinders inside it neatly. Also, 9 is 6 times 1.5, which is the voltage of an AAA, AA, C or D cell battery. So then I thought, you know what, I bet a nine volt is made of six small batteries wired up in series. Sure enough….
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3 replies on “9V battery”
It looks like a bomb!
You scare me, why were you thinking about 9v batteries??? :}
I remember when the 9 volt batteries first were introduced – 1960 ±3 yrs. My grandpa brought the first transistor radio I ever saw back from Florida about then. It cost him $60 (a big lot of money in 1960!) and it had an ear phone and a “genuine leather” case. It was about 2 1/2″ x 6″ and it was a “miracle of modern science”. It used the then brand new 9v battery henceforth to be know as a “transistor battery”. No other battery at that time packed that much power in that small a package.