Weiss - more power + UR18650F / LIC18650_2.6SN 18650 Li-ion battery (Cells by Sanyo) 2600 mAh, 2-pack (tool)
I use the batteries in my LED lamps, currently mostly in a NiteCore MT26, but also in a Lumapower M1, a Fenix TK35 and in S20. The batteries I invite a NiteCore Intellicharge, and so far I am very satisfied. I have thus brought about 50 charge cycl