Yes, because it's regulated. I've been using AW RCR123 Li-ion for years in my A2.
Because of this post, I just blew my Lumens Factory HO-A2 bulb.
edit: the filament in the bulb looks fine, could it be the regulator in the A2 that was fried? My LED's still work, and on the hard press that would usually fire the incandescent bulb, the LED's seem to get slightly brighter.
I'd appreciate some feedback/advice before I got buy a new HO-A2 from LightHound.
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