How do the e-cigars fare as compared to the smaller pen style e-cigs? Seems that battery and cartridge life on the smaller e-cigs is pretty dismal (along with the failure rate
). Are e-cigars more reliable? Do the cartridges and batteries (mainly batteries) last significantly longer? I like the idea of being able to buy some decent batteries (that aren't part of the device) and a charger that I won't have to baby sit. I'm not concerned with the size, I just want something that I won't have to plan my day around
. I've been looking at the Ruyan and the Crown7 and they look the same (maybe even compatible cartridges?) but I don't know if they are the same. I would prefer to buy locallly in the US but if the Ruyan is higher quality then I'm willing to deal with customs
. Also, what size batteries do the cigars use? Thanks in advance guys and gals! 
