to add a seriouse comment.. e cigs come with most the powerfull lithium-ion cell that can be fitted in them.. its a size thing.. u cant simply
buy a "better" one..
the 10440 600mAh 3.6v ultrafire batterie u have fitted to your bling are also telling lies.. in reality they will be more like 350 mah at the most..
the screwdriver 1000 mah rated ones will be 750 mah or so.. chinese battery makers tell fibs..
for comparison.. a 901 mini is rated about 130 mah..
trog