I noticed with my TC40w that when using the temp control it eats thru the battery like crazy! idk if its an Istick thing or if all tc mods eat up power like this... the 40w doesnt come with a removable battery deal either, itd be nice to just throw a fresh charged 18650 in there and not have to wait on it to charge, but ive got the akuma for those times so it could be worse