This can also be done with a 9 volt battery!
Step 1: It's So EZ!!
I picked up a couple of A23 Energizer Batteries at Wal-Mart for $1.88. What a deal!! If you look carefully at an A23, there is a split in the label/housing. I used a small screwdriver and peeled away the housing revealing a piece of paper.
Step 2: What's Inside??
Peeling back the paper, I found 8 (1.5 volt) button cell batteries!! These are perfectly good button cells that will work in any 1.5 volt device they fit in!
Step 3: Save $40!!
I matched the battery at Radio Shack and 1 of those button cells cost $4.99! Do the math! This easy hack gets you 8 button cells for about 1/2 of what one costs! Have Fun, Be Sfae! Hope you enjoyed this EZ, money saving hack!