I've been trying to get a handle on how "safe" battery MODs are given the type of failure modes that various battery chemistry exhibit (some of which are explosive!!!). I found some good info about Lithium Manganese (LiMn chemistry like that used in the AW IMR batts) here... GM Battery After reading thru what I've read. I think the ONLY type of batt I'd be comfortable with using with a MOD are these LiMn batteries. I expect to be carrying a MOD almost all of the time, 24 x 7 365 days a year. Sooner or later... I can expect a battery to fail.