Just happen to think about this while swapping out a battery on a dx, something I was going to mention in that long post with the pics of the hotcig taken apart. Those two battery posts that stick out from the
mod half, they have two cuts down most of the length leaving four sections on the post. Check them every time you remove a battery and make sure they haven't collapsed, that's why it warns in the instructions to pull and push the pack on straight. One side can be tight and the other loose and still make it feel like the pack takes force to slide on leaving a loose fitting connection. I found the blade of a cheap little break away razor knife like the pic below should slip right in the slots with a little wiggle room, if the blade goes in tight just use it to tweak them just a tad. Don't over do it or you'll work harden them to the point a section of the post could break off, a slight gentle spread is all you need. Look at the gaps on the end of the post and you can tell if the gaps are too big or small.
