Mini 1000 mAh Battery Extender and Mobile Power Station for iPod; iPhone 1G, 3G with (White)
Seems fine, it has charged my phone a couple times but only 10 or 20%....mostly just to get me to the end of the day.  Now the other day I plugged it into my 3GS and my phone died.  Battery got hot, and I unplugged this charger and the phone continued to get hot.  Phone was dead, had to get a new one from an apple store (make an appointment online).    Point being is I am not sure if it was this battery that killed the phone or not.  Could it have been a voltage spike from the battery?  Not sure of the qual