That depends on how old it is... well, if it's *really* old it will fit 2 CR2s and you can do 6v, If it's in the middle then it won't and if it's within about the last 6 months then it will
The way to tell is measure the bottom.
Stand just the bottom up on the table and measure from the table top to the top of the
threads.
62.85 mm (63) ==> yes
57.93 mm (58) ==> no