Not good buys. Go for something like this: http://www.amazon.com/Tekkeon-TekCharge-Mobile-Battery-Charger/dp/B0014KLX9C/ref=sr_1_1?ie=UTF8&s=wireless&qid=1261204869&sr=1-1
I have one, pop 4 AAs in and you have a much more versatile charger. You don't have to worry about the pack itself dying (or blowing up), and you could use rechargeable batteries (I used 2500mah energizers)