i use those 18650 cells in some of my lights stated capacity is 2500 mAh. I have 21 of them one was DOA lowest capacity was 2140mAh highest was 2330 mAh. dam good cells for the money .

http://www.candlepowerforums.com/vb/index.php? maybe worth a visit,read this thread http://www.candlepowerforums.com/vb/showthread.php?t=106242 if you are new to lo-ion cells