I use the AW IMR 14500 (600mah) and the EFest IMR 14500 (700mah) They both fit perfect. And it doesn't matter if they are the button top or the flat top, I use both.
I also have Ultrafire 14500's and they DO NOT fitThey look the same size but the battery jacket seems thicker or something, won't slide in the tube for me and I'm not going to force it in there.
Well after thinking about it I went ahead and ordered 2 EFest IMR 14500 (700mah) just to make sure I had batteries that fit when I get them.
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