Thanks for all the suggestions guys. To answer your questions, I have two rechargeable packs, one I got in 2006 when I got the system, and one a few years later. The 2006 one doesn't keep a charge too well...it takes forever for the charge light to go green, and when I does, I can play with it, but then when I stop playing and come back the next day, its discharged...it's pretty aggravating and I just don't want to deal with it anymore. I feel like eventually the other pack will do the same thing. I think that going the rechargeable AA route will work, and I will definitely look in the options presented here.