Now that I upgraded my original iPhone to the 2.0 software, I am using it more and more with my hosted Exchange account keeping me in sync. Just like folks who are using the iPhone 3G more since it is faster and there are lots of third party applications available, I am using my iPhone more with the syncing and application testing. Thus, I am not able to get through a full day of using my device without somehow charging up the iPhone. I may be able to connect to a PC or Mac from time-to-time, but I am often out and about so I needed a mobile solution. I received a Richard Solo Smart Backup Battery a few months ago and used it once or twice. Now with my new battery challenges, this external battery solution has proved vital to my iPhone usage.