When you say "they are calling the 900...mega" atomizer, do you mean litecigusa or a China site? I must've missed any mention of mega. It's simply longer for greater liquid capacity.
So I guess there are currently 3 types of M301 atomizers on the market. The Xpower atty (the longer version of the M301), the standard M301, and the M601XL which electronic-cigz.com had made (?) for them, which is an M601 exposed atty with a metal sleeve placed on it, making it essentially an M301. I tried all 3 types, plus the M601, and given a blind test I don't think I could tell one from the other on taste alone on those 4 atomizers. The M601 might possibly have a slight advantage in flavor because it is an exposed atty. But the M301 (and the Xpower atty) trumps that for drippers like myself. The attys I mentioned will fit both the Xpower 650 and the Xpower 900 models of course.
The Xpower comes with 2 types of proprietary batteries aka power unit models, the 650 and the 900 mah. The 900 is of course a bit larger than the 650 because the 900 has more battery "stuff" in it to make it last longer per charge. If I remember correctly the M401 is like a 180 mah. The general saying is 100 mah means about 1 hour of vaping, though that's really optimistic. I think if you divide the mah rating by 200, you'll get a more realistic vaping time. So a 900 mah unit should last roughly 4.5 hours.
I think--not positive since I didn't order an M801 cartridge when I got my M801 atty--the M801 cartridge is an M401 type of construction with an inner bucket as you call it. You're right, never though of it that way but it does sort of resemble a tiny elongated bucket. Hope no one fell into the well.
I ordered the M801 atty out of curiosity, thinking it may be a Blu, or a 306 type. If a 306 type, I figured I could use a 306 drip tip on it. The M801 might be a hair wider, making the 306 drip tip not easy to use on it.
Kemuri, as always you take the time to explain things so well... thanks!
I have some 901 attys so I know what you are talking about with the filler chamber. The no bucket deal does make things easier but I have gotten good at popping and filling my 401s. I fill a few at a time and the great flavor makes this something I don't mind doing.
So I guess the 801 is for those who have 510 thread type batts and want to try the Smoore type attys. I have 901 threading but not 510 so I ques I wont need an 801. But wait... I could get a 901 to 510 adapter and use the 801. But hmm?.. does the 801 cart have a bucket?
I do wish I could hook up a 301/601, and also a 650/900, to my 3.7V 905 901 thread mod. I just hate to get more chargers and batts. They will make adapters someday I'm sure.
Oh, but do the 900 carts fit the 301? They are calling the 900 carts a "mega" so I figured they were bigger. Yes, 1/2' is allot bigger.
Just one more question... what is a 650? Why call the X-Power atty a 650/900? Oh, that's two questions. :~0
Joe