Oh! yeah, I just did a quick search on the 601 at the time. Your totally right, if there are 510>601/301 then they have to be 2 totally different threadings. i see smoore has 2 different versions of the X power but the only difference seems to be size and mah rating (650-900mah) by going by the pictures, it does seems that these are 601 standard by the overall length of the unit's cone.
Hey good buddy, Thoughts exactly well placed, maybe it preforms a bit differently? or it's just something "new" on the market. Ok here's what Im hearing about Boge's 306 atties, they're said to be slightly longer, but I'll get on with them tonight to find out more specific details. If you might know anyone that has a micrometer and a Joye 306 atom, can you grab some measurements for me? We'll get the HV306 made, but just need a little help