sorry trog, maybe a stupid question: " why not to try with the mobile phones batteries, they are getting better and better
they are still basically lithium batteries.. lithium battery technology is improving but not in leaps and bounds.. so it comes down to shape size and price
also using existing atomizers limits the voltage to single cells of around 4 volts and a bit under..
if the job was done from scratch batteries can be made in any shape or size.. but the simple (mass produced) off the shelf cylindrical ones are both cheap and functional..
a normal e cig battery is a simple lithium cell.. the only problem being cos it has to fit in a cigarette sized tube it cant be big enough.. to be honest the ones being used do a remarkable job for the size and capacity they are..
but its a "chinese" thing.. they make what we want even thow they cant work properly.. i call it a "chinese" thing because only the chinese would make such things.. they know we want cigarette sized devices so they make em for us..
a cell (mobile) phone started off the size of a house brick..i had one twenty years ago.. its got smaller as battery technology has allowed it to get smaller..
the chineses use a different kind of logic.. they make "small" before small is practical.. they do this cos they know its what we want.. we also think clever (new) technology can get a quart into a pint pot.. but where batteries are concerned it cant.. and its not likely to for some time..
trog