4sevens description of the Fenix PD30 does show that 2 RCR123 are compatible. However, is does not specify protected/unprotected (assuming protected). Basically I like both the new PD30 and the Quark 123x2. However, im tired of buying batteries. My new Nitecore EX10 can use protected RCR123's so the light that wins my primary light will go to the one that has the best output/runtime with RCR123's. I would like to get a car charger (Ultrafire) for the RCR123's so im never in the dark. Further, I have never handled either light. I like the heavy tank feeling torches. I love the feel of Surefires but think they are over priced. They are tanks for sure and I own many. My M3 Combat light just eats batteries for breakfast lunch and dinner and is not as bright as i would like it. (cant afford MilkySpit upgrades LOL). I just think they need to lower prices and step up the technology