this is my 3 am dead ego v3 build nothing special but battery life vs weight is realy good 3k 26650,v3 chipset,and using the usb charging port on the chip to charge the battery. yea it is a slow charge but isnt a issue for me since it is just a novelty mod to prove to myself i could do it without breaking everything in a million pieces trying, those wires are cat pube thin!!. the battery is alone a tight fit in the mouth of the bottle and the wire set is realy short for the opening restraints and working areas involved, next i am thinking a ti 10 mod setup this way just as a learning challenge i like to do things as difficulty as i can it seems. nothing special but was a challenge to just do imo