I have a couple of those turbo charger things. And like any diligent ETSer, I tried it out in a controlled situation. CR@P! It gives you enough juice for a couple of short phone calls on one AA. It seems the newer the phone, the worse it works.

Now the Motorola mini USB charger is fantastic. One fully charged recharger will give at least 2-3 FULL recharges to your phone. I have tried it on three different phones, including my Blackberry Pearl, my wife's Motorola Sliver, and her friend's something else phone. All on one camping trip! I think full recharge of the phone takes 1-3 hours. I am not sure as I charge mine after a couple of days when I am sleeping. My wife's friend's phone went from about dead to fully charged in 1-3 hours. I wasn't really keeping track of the charging time while at camp. But she did use her phone with the charger plugged in. It looked kinda funny, but it worked.