I bought a G2 the other day for 20 bucks. I have since bought the z44 head and a remote switch for it as I want to use it for hunting at night. My question is about some modifications I am looking into like the body extender. How many 123 batteries can I run? Can they be Run so to extend the usage time instead of upping the volts? say for instance can I run 4 123 batteries giving me 12v on the stock bulb?