The other day my dad got me some new type nimh rechargable batteries from costco. They are called Eneloop made by Sanyo.
I have been using them for several weeks now. Both in my Altec Lansing inMotion ipod portable speakers and in my Canon S2 IS camera. They last amazingly long and recharge way faster than my Energizer batteries. Usually the energizers can go dead within a few days. They also take over 30 minutes to charge on their own 15 minute speed charger. The eneloops can last over a year charged without use. They even come charged in the package. I also just charged a set of four AAs in 10 minutes on my Energizer charger.
They just rock. Finally what rechargeable batteries should have been all along. I definitely recommend these to anyone who wants to be a little green and not use disposable batteries.