Hi Izan thanks for your reply I have h cigar foggatti genesis atomizer that has 18350 battery I was tired of charging it every hour. I had a 5000 mah power bank I managed to power the mod with it. I did 8 wraps with the 28 gauge KA1 wire and it is working very nice power bank is not getting worm at all I thought 5 volt divided by 3 amps will give me 1.66 ohm I know 8 wraps is less than 1.66 but it vaped very good power bank has 2 usb output each is 3 amp do you think I am doing something terribly wrong