Spec appears to be 50mm long by 14mm diameter.
However, I have had problems inserting some batteries into torches, most notably the 49 led 3AA carrrier, which strips some nimh batteries upon insertion due to very tight fit.
Similarly, AA into single AA led light, especially Ghost 2, tight fit, almost creates a vacuum trying to eject AA.
So, here's a task, please measure your AA batteries, if you have the necessary accurate measuring evice, and post results here.
Slightly less accurate, wrap a strip of paper around the circumference of the AA, then divide length by 3.14 to get diameter.
Alkaline, nimh, Lithium, etc