All Lithium batteries don't leak because there is not liquid inside Lithium batteries, wheather it is AA, AAA or CR123A. They have very long shelf life and can be left inside your equipment for a long long time. However, they produce hydrogen inside your equipment batteriy chamber, that's why you'll get a weird pungent smell (hydrogen) when you unscrewed your Surefire torches and other devices that use CR123A lithium batteries.
One important thing to note is, never immerse Lithium battery into water as lithium reacts very violently in water (H20), and if you have equipemnt that use more than one lithium batteries, please replace the battery as a set, and NEVER ever use new and old lithium batteries together in your equipment as doing so may cause reversing charging leading to explosion. As a torchlight hobbyist myself, I have came across numerous cases of torchlights (that uses multiple CR123A) exploded, both locally (heard of 2 cases) and internationally, just because the user mixed an old lithium with brand new one. Lithium batteries need to be treated with respect!