Currently running a streamlight pro-tac HL with CR123 batteries. The Argo HP is similar but in plastic for less weight. I keep a spare in my BWCA deployment pack. The CR123 works better in the cold conditions we deal with up here. Got a Pro-tac HL USB on order to try out. I keep a bunch of Strion & PolyStinger lights on chargers in my squad, they work pretty well for hand helds.