2x3.7v RCR123's, nope. (oops, can it really take 9v? Guess I'm wrong. I was probably thinking of three-cell SF setups, 3x3.0v vs 3x3.7v)
2x3.0v RCR123's, yes, but they stink for mAh.
Can some of the experts chime in with using a single 3.7v 17650 with a P60L? Voltage is borderline for regulation but runtime would stomp 2x3.0v RCR123's. And at least the LED won't dim (80 -> 60 lumens) as it heats up like a 2xCR123 - it would be already dim.