If paranoid about batts go with the AW Protected as Kay said. I dont worry about IMR AW batts at all. maybe that's just me.
Out of the thousands of users of Li-Ion batts there has been a few cases of problems and a few of those were people that had incorrectly inserted batts backwards and were also using unprotected cr2's back in the days when we didn't have a choice on batts to choose from. Can an accident happen, sure it can, but how many people have we heard about out of the thousands of users using these newer batts? Almost none.