to the family Wandering Soul!!!!!
For the record, you question is a great one!!!
Yes most batteries are the same, AA, AAA, D...etc, etc...
When it comes to cell phone and camera/video camera batteries, you may want to contact the company who made it to find out what happens if your battery goes tits up while your away.
Here is a site for Travel Adaptors
you might find what your looking for there, you might just need one converter, or a few for different countries, here is a List of Voltage for the world
Should help a bit!