I recall buying B batteries for an old fashoned large radio my Grandfather gave me, I believe.  It was a rather large battery in a square shape.  Like you, don't believe I have seen an A battery.


Edit:  After posting the above, I started thinking about battery sizes also.  I did the wikipedia thing, there is a picture of an A battery and a B battery.  The B battery is round, not at all like I thought I remembered buying as a kid for my Grandfathers old battery radio.  One of the two said it was used in Russia, and it gave the sizes of both the A and the B.  In the picture, it looked just like a AA battery.

I am sure I did buy a square battery for the old time radio, thought it was called a B battery.  After it ran down, just like any red blooded american young boy, I tore the paper casing apart to see what was inside.  There were several cells joined together comprising a square shape with heavy cardboard around it.  If that was not a B battery, now I;m going to wonder for some time what the designation was.