I wanted to keep as much of my equipment as possible "AA" compliant. There are excellent products on the market that give you power backup for phones and PDAs. Charge2Go is very compact, well made, and works (uses 1 AA battery). I have one of those for my wife and daughter's phones. Since they don't make an adapter yet for my Treo 650, I purchased a battery backup from Gomadic. This one uses 4 AA cells. The celullar system may indeed go down, but I have my Treo packed full of MP3 music, survival informaton, books, etc. etc. The world may come to an end, but I'll be reading a good book on the way out <img src="/images/graemlins/cool.gif" alt="" />