Digital Imaging Accessories Review: The Great Battery Shootout
This is really a great article, it took me a while to find it though. I was looking for a NiMH AA charger and batteries for my SONY travel speakers -- this article covers the ground like nowhere else.
I ended up buying a Lightning Pack 4000N. They have a super reputation for tech support, a lifetime warrantee, a great web site, lots of details. For about $40 I got 12 batteries and the ultrathin portable intelligent recharger. This should pay for itself between the speakers and other devices, and it feels less wasteful than dumping all those alkaline batteries.