Gemini, a graupner neptun, 7,2v nicad, simple answer, I had some lying around for use on espirit d'atlantique, so of there there why not use them.
celestia, Graupner Sydney Star - 6v 12ah, thats cos the boat needed a BIG A$$ battery! (actually it had to have 2 but one was enough), and the 12v batts were too big for the hull, this left the 12ah as the biggest possible battery that would fit!
Yamato & Nord Icelandia - 6v 4.5AH - thats is what fits in the hull just nicely
Espirit D'Atlanitique - tamiya plugged batteries, 8.4 or 9.6 - 8,4 for cruising 9.6 if i want to be manic!!
Southampton 7.2v (AA) - cos thats what fits!