BrianAndPamela.com

 Link to Triple "A" Battery Hack

Found on Digg: Ever needed a "normal" battery cell but you can only find a 9volt?  Have no fear… pull that 9volt apart to reveal six 1.5 volt cells that are a little smaller than AAA cells (they are, in fact AAAA size…).  With a little aluminum foil padding, you can make them work in a pinch. 

There's nothing special about batteries, you know, only the sizes.  In fact, if you have an adapter (or make one) you can substitute among the "common" sizes, they are all just 1.5 volts.  Now the life of a smaller battery will be reduced in a system with a larger power draw (Interesting link on the mAh ratings for each standard cell size) but it should work in a pinch.

So there you go.