From what I know, exploding lithiums occur only when you mix different types or brands of lithiums. Also, el cheapo foreign imports have been known to blow.
I think the shipping of batteries alone, by themselves, is forbidden in the manner described, but not when they're on "active duty" in a flashlight.
But don't bet the farm on it. These things seem to change day by day. <img src="/images/graemlins/tongue.gif" alt="" />
-- Craig