Quote Originally Posted by Tom1956 View Post
If you cut open a 22.5V battery, I wonder if you'd find 15 batteries somewhere in the AAA to AA size range. I've made Hasselblad EL packs and RC flight-controller packs and such.
You must be thinking of a bigger battery. Those 22.5V batteries are about the size of a single AA cell. I'm not sure what is in there, perhaps a stack of thin button cells. BTW those 22.5v batteries are also used in the Horseman electronic solenoid shutter release.

To the OP, thanks for sharing this project.