I'm going to change the direction of this slightly. We have some Eneloop batteries that I have recently tried with some rental Sennheiser EM300 beltpacks getting at least 8 hours out of them.
We are about to purchase 12-18 new receivers and will be purchasing Eneloop batteries to go with all of the packs. The question I have is what are people using for charging units? I would like a sled that can charge 8-12 AA batteries at a time. I don't want to have to deal with units that only do 4 at a time. I am going to be charging anywhere from 24 to 36 batteries at a time.
Andrew