Hikermor, the strobe in Russ's link uses standard AAs, it was the older military strobe that used the special battery. There have been modifications for those old ones to take a CR123, but they are not durable or reliable.

The firefly is not as durable. I tried those and had 2 out of 5 fail sitting on a shelf. I found them during my normal pre-operational inspection, and I converted to all of the military types. I have never had one of the ACRs fail on me, and I abuse them.

The advantage to these dedicated strobes is ease of use (one hand operation), 360 degree light (no need to point at a target, great when you are injured), and durability.

These ACR military strobes are generally expensive, anywhere from $60 to $120, but I can get them for much less. I do not send anyone out without one, even when they are carrying the PLB. You can turn them on and guide someone to your position without alerting the SAR folks.