I unretired my KR808D, didn't like the results from the cartomizers 2 years ago, figured I'd try it again with all the new types of cartomizers coming out (not the ones you need needles and syringes to refill,
I'm wonder enough now if a cop pulled me over if they know what ecigs are; what they would do if they also saw needles.) Both my Batteries are regular size manual. Put the cartomizer on the black one and it works perfectly. Put it on the white one and nothing; power does not get to it when the button
is pushed. Both work the same on the older style cartomizers. I did notice the good black battery is slightly thinner, almost unnoticable, and only about 1-2 mm shorter. I'd be afraid to buy another KR808D since I've only seem them described as regular and mega. I don't remember where I bought the batteries. Thanks if anyone can shed some light on the difference in performance on the newer cartomizers with almost identical batteries.