John, yes the batteries are fatter than a regular 808. I know the inside diameter of the carto is 1 mm. I have used the ClearoCartos, but not for the DM1. When they work they are a very nice carto. I have just had a lot of issues with them. I have about 4 in working order-out of 15. So they haven't held up well for me. I had 2 that acquired a leaking problem from the bottom, 1 that was cracked in the package, 1 that got warm & tubing just lifted off atomizer when I tried to unscrew it, the rest all cracked & no I wasn't screwing them on too tight. I believe I heard about a mod to these maybe using syringe type plastic. If anyone has a link to that I would appreciate it, or if anyone knows what size syringe you would need to get that would be helpful.