Gene Malkoff's 'lights come with Battery Station Cells installed...
I put one up against a Sanyo and a 4Sevens and in my HDS 140 ex. got identical run times (more or less). The Battery Station started out a little lower than the others and gave about 40" less - 3.23V as opposed to 3,26V. I repeated the test, replacing the Sanyo with an Energizer and again there was nothing in it. At $12.85 here in Aust. (not a typo.) for top CR123's, I'm not likely to repeat this test ever again! It did, however, tell me what I wanted to know; the HDS ran for 77min. on high before stepping down and was consistent across 4 different cells. I used a small personal fan to circulate some cooler air around the HDS; not because heat was an issue but to even things out a bit for all cells. Indoors, v/hot, muggy, I could have have hand-held the light, I guess.
I thought the run times being almost identical was astounding: There was only seconds in it!