Ah my good man, not a simple answer.
I have been using mine for quite some time now with an AW 18650 IMR (nippled version) without any issues. although 18 of 18650 stands for battery diameter and 65 stands for length, and the zero = cylindrical most protected batteries are 67 - 68mm long (68mm being AW LI Ion) Because of their length the AW LI Ion is too long it is difficult to screw on the power module, which may lead to cross threading the power module.
Now I cannot attest to other brand batteries as all I use is AW. I use AW because of their consistency wrt performance and battery specifications, to include but not limited to dimensional integrity.