I've made over a dozen 3AA box mods and never come across this problem. I used the stock parts from MV (based on the circuit detailed here http://www.madvapes.com/Newsletter-82611_b_22.html). The weird part is when I connected the batteries it fired up without the switch being pressed. In fact it fires up without any switch at all. Luckily I have a master kill switch installed. I checked all my joints, checked for any solder bleed over that might be completing the circuit, etc. The only thing I can think of is that I attached the LED long post (the one with the resistor) to the B5 hole and the other end into the C5 hole instead of soldering it directly to the outside of the atty connector as per the directions (I am using a USB battery pack body so space was a concern). I wanted to ask you guys before I do some desoldering. cheers.