Take a look into a rechargeable battery pack with a USB charging port. You can charge theM and take them with you, and a proper size can give you up to 2 charges. You can find them around $20, and you'll save that on AA batteries down the road.
Posted from my CrackBerry at wapforums.crackberry.com
I found one at Target a while ago for like 7 bucks, I think it was like 15 new, it was an opened box so it was cheap. It comes with a number of adapters for various ports. I only used it once for about 20 minutes and it worked great. I carry an extra BB battery around now though.
I m using such an AA battery-powered portable flashlight travel charger for my iPod touch as well as for other devices also that are loaded with a USB cable.It takes very less time to charge and easy to use.You can use it with the Blackberry also.