From what I'm reading, when using lithium batteries (CR123's) in pairs or triplets - regardless of brand - its recommended that you get a good meter, and before use, test each cell to make sure they have full (equal) charges. I guess it is dangerous to put a full battery with a nearly spent one - that can result in dangerous conditions (exploding).

A commonly recommended meter:
http://www.ztsinc.com/minimbt.html

I got one of these a while back and it is nice.