I will first admit I do NOT have much experience with modding. But, would it be possible to remove the guts of a 510 battery and somehow get a 18650 in there? I want the 18650 battery in a small 510 package so you get much much much more time between charges. Im sure the 18650 is too big to get in there but wouldnt it be possible to find some kind of casing so it stays as close to a 510 size as possible? Am I asking for too much? Am I being cheap?