I used mine with Eneloop XX, great performance. I put a 14500 just to see, and it gets ridiculously hot on Max in less than a minute. Since giving it to the girlfirend its been on a steady diet of L91s.
How unfortunate to read this. I was just thinking about getting a D25A to use with a 14500. It was on my wishlist. My SC52 runs on a 14500 and doesn't get too hot. I don't run it on high very often for very long though. I'll have to strike the D25A from the wishlist. Too bad. I really had my sights set on it. Hmmm,...I wonder if the Armytek Partner gets too hot?
The 2014 Ti now supports multiple modes with lithium ion batteries. I just picked up the 2014 D25A Ti Nichia 219b. This has been my first Eagletac light, and I'm absolutely loving it. And incredibly, on high it's just as bright as my jetbeam RRT-01 v2. Just insane.