The Small Sun A629 has become my EDC at work going on two weeks now. I find the beam density impresses folks more than some of the much more powerful and diffuse lights.
Even better, the lightweightness of it and fast PWM makes it ideal for low-lumen use. Mine is set at 82 lumens, which I find ideal for simple, practical tasks. It is running a Keeppower 3100. Love it!
Got my first dud 2800 mAh Sanyo yesterday (one of the nail polish colored ones). 0.00 charge. An absolute dud. Lasted through 3 charge cycles, then gave it to a buddy. Putting it in my i4 charger actually made it trip to cut off for safety! These have been the best batteries.