Romisen RC-C8 II R2. OK I have to ask. what kind of runtime are you getting on this and on what kind of batteries. 3 AAA's doesn't sound very promising to me. I wouldn't waste my money on the CR123 or the 18650. you can't recharge them, can you ? if you can't recharge a battery it's not worth having IMO. LED'S suck the juice out of a battery and its difficult to find a decent LED flashlight that gets a good runtime of three hours or more. I had an old Romisen RC-N3 that I bought in 07, but i wore it out. I was getting close to five hours on that before it would dim out on me.