One of my Dura's batteries has given it's life for a mod, couldn't take it's short life span anymore. I did use the pipe cutter, and that is some tough tubing. After using a pliers to remove the end cap, I managed to get the battery out with much struggle. then went to work with the pipe cutters. Ended up cutting just behind the battery mount! Then a little work with my dremel's cutting blade and it's on to a better life, this time with an 18650 battery behind it.
Next time I think I'm going to try just the dremel to do the surgery, 1 cut just behind the az, about 1/2 way thru, then a slice parallel to the battery adaptor. Should come out very cleanly.
This is getting to be fun!