I had a Panasonic CGR18650, but I was there to use suffering the miserable UltraFire parallel on. So I treated myself to two more batteries. These hold 3-4 times as long as my UltraFire and bring me each loose throughout the day. Normally a holding by 2 extra days! They are used in the EVO LCD meißt at 3.5V.
I can only recommend the batteries to anyone who wants to get the maximum out of his carrier VV battery - this is true of the term and the capacity alike.