Suck it, MacGyver. This is even better than that one where you make a washing machine out of a baked potato at the end of season 2.
How To Get Eight Watch Batteries From a 12-Volt Battery
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.
12 Volt Battery Hack! You'll be Surprised... [Instructables]