Rechargeable batteries are the best, no? How come no recommendations for them, do rechargeables not work in mics or something? I don't use them for mics so I don't know. But I use them for bike lights, mp3 players, remotes....don't see why a mic would be different.
I get the maximum mHa, and I find they last much longer than non-rechargeable batteries. I keep a pair of AAA and AA charged up so I always have a back up set if I run out. Gad, I could have 12 batteries powered up and ready to go if I wanted to for a few pennies a pop. IMO Normal batteries are a massive waste of money, not to mention an ecological nightmare.