I saw a posting discussing RichardSolo's iPhone battery pack but no one had real experience with it so I ordered one to test it out. I can say that it works well, especially for the $50 price. My iPhone had drained down mid-afternoon and I plug the thing into my iPhone. Phone immediately indicated "charging" status and worked as such. Left the battery pack plugged into the phone and within about an hour the battery reading on the iPhone was 90% when I removed the (drained) battery pack. Works for me. I keep it charged in my briefcase and throw in on late-afternoon when the iPhone goes light if I am not near a wall or car charger. Very light and thin. Also has the benefit of being able to charge the phone and the battery pack at the same time with one electrical connection. I recommend it for those concerned about their batteries and being stuck without a phone.