Do-it-yourselfer Kipkay did a little investigating and found that beneath the shell of a run-of-the-mill 12-volt battery was eight watch batteries. Considering watch batteries cost between $4 and $6 a pop, finding eight of them in a $2 battery makes for quite a savings. I guess this isn't surprising since 9-volt batteries are filled with six AAA batteries.
Get Eight Watch Batteries From a 12 Volt Battery
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