The L2 I had was a battery eater. The low beam was so bright at 15 Lumens that after I used the light a while and drew the batts down a bit, the high beam wouldn't even come on. The batts had to be fairly good for the high beam to come on. The most agrivating part about the L2 for me was the twisty tail cap. I was constantly adjusting the cap to keep the "momentary on" feature timed right. And it always felt "long" in my hand. I eventually sold it and bought a U2, which is the same length, but feels great in my hand. jmho.