Same here. Zebralight 18650 as my primary with the little Petzl in my possibles kit as an emergency backup. Going on about four years now, I think the only time I've turned on the Petzl was just to make sure it worked when I first got it. Lots of good options out there but that Zebralight is tough to beat.18650 Zebralight continues to prove itself in the field. Fantastic moonlight mode through blinding 1500+ true lumens high range is hard to beat. Extremely long run time is why I prefer the 18650 battery. It has about 4.5 times the capacity of 3 aaa cells. One battery will last about 8 days continuous running (yep, 24 hours a day for 8 days) at camp brightness, or 4 months on moonlight.
I carry a Petzl e-light as a backup. It weighs less than an oz.
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Petzl Tactikka, two tours in Iraq and still rocking