Well--it looks like a problem I was having with my 5 volt mod box had to do with a bad shipment of batteries from my vendor's supplier--and it will take some time for him to get in some new ones. These were Trust fire. I'm looking for what would be a good 14500 battery to order in the mean time--something that will not cut off with every hit. I'm using 3.2 ohm 510 cartos and standard 510 atomizers. Any suggestions from the experienced?