Hey there ECF I just started doing my own mods. I have been using an e cig sence I got the smoke anywhere from a stand at the mall two years ago. Now I want more. I bult a 5v regulated box mod from madvapes. Now I wanna do a milled aluminum tube mod. I just don't know how to do the batteries in it. I only use 14500s. (Love the battery life) Any ideas how to do the batteries. Side by side was my idea. I am thankful for any and all help.