Todd Peach , Sep 11, 2003; 12:50 p.m.
In that form factor, I have always considered alkaline batteries a 'last resort'. Silvers in an FE can run the camera for 2-3 years (though it's a good habit to change your batteries on your birthday anyway, sort of like smoke detectors). Alkalines seem to poop out in 6 months or so for me. The lithium ('double stack', works in the FE and FM3a, I don't know about the Mamiya) has the best 'shelf life', and is the one I have squirreled into the bowels of my camera bag in case I need one.
I *suspect* (no real experience) that the lithium might be the cold weather champ as well.