Haha yep John will certainly add the reverse battery protection on his next chip. Hindsight is always 20/20. That company has sure changed vaping for the better. I lay the battery next to the one I am swapping too. What did you use for those bands on your batteries. Is that battery shrink wrap? Those look nice and clean. Were they precut from somewhere?
On those batteries I had 1/8" chart tape. But they would not fit in my mechanical mods with the tape on, so now my batteries are just marked with a couple of permanent marker stripes at the negative end.