I carry a ton of AA (GPS, Sight & Radio) and CR123 (Strobe, Surefire L2, & Surefire Weaponlight) and a few AAA (LED Headlamp) I also have a couple 2302s for my watch and a few other goodies.
I still plan of switching to all AA when it is practicle, but I doubt it will be anytime soon that I rid myself of the CR123...
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"Trust in God --and press-check. You cannot ignore danger and call it faith." -Duke