Quote:
Originally Posted by guruclub
I found this 3G iPhone backup battery and compared with the market available 3G iPhone backup battery. This one is very powerful. I bought one called IMP500 and it is more powerful than I thought. After fully charge it up and it can be used to recharge 3G iPhone 4 times. I like to recommend it to 3G iPhone and 2nd Generation fan
Pros
Big capacity,
Nice design
Easy to use
Cons
Need a USB cable, I like cableless more
But with 50$, it is still a good buy, check this out
imaxpower.com
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When I googled this, the first url returned was to a video demonstration. 5000 mah. Same technology and source as the iPhone battery.
Big advantage of the USB cable is that the battery can be used to charge arbitrary devices.