Its not just unprotected cells guys, its the fact that it only takes exactly 65mm cells. I know of no other flashlight, or any other average battery powered device for that matter(aside from proprietary), that is so limited in its cell compatibility. It might as well be a proprietary battery like Sonys old rectangular AA. Plus, it has such tight tolerances that I question the long term connection reliability. The fact that the pressure on the contacts is so low that the battery rattles, unlike a spring contact, when it is brand new is a concern to me at least. I could see these models having connection/flickering issues down the road. Even if they hold up, I just dont think it was a wise decision on Zebralight's part. Just the strong opposition in this thread alone proves that. Any design that a large part of your customer base is strongly apposed to is a bad business decision imo. I know ZL likes to be different, hell many are apposed to their goofy looking ribbed designs too but, I think this different. I for one hope they stick with their usual design(SC62, SC600, H600 exc.) or a better and more compatible one going forward.