I EDC an Eagletac D25A. It takes a 14500, which I use regularly, but also takes an AA.
I learned the hard way. My previous EDC for years was a CR123 light. On two separate occasions I was in fairly remote areas when my light died. The first time I dismissed as a low chance of happening again, but it did. It was over a year later, but it did happen. There wasn't a CR123 to be found. However, there were AA's everywhere! Lesson learned. Not to mention, CR123's in most brick and mortar stores are very expensive! I have seen as high as $15!
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Three is two, two is one, one is none. There is a reason the astronauts always had three of everything on their spacecraft--a backup for the backup.Anything mechanical can and will fail, and according to Murphy's Law, fail at the worst possible time.