Thanks for the info guys. Isn't it amazing how progress changes your perspective on things? Technology that worked so well for so long (AA rechargeable batteries, 72 MhZ radios) suddenly become much less desirable when new technology comes out (sub C battery packs, 2.4 Ghz radios). I believe what you guys are saying, but I am unsure how it happens. If two battery packs, one made up of AA cells, the other of sub C cells, have the same mah rating (say 2000 mah) how can one last significantly longer than the other? Mind you, I am not arguing with you--simply wondering how it happens.