What to look for when purchasing iPhone external battery?

Next month I’ll be taking a 5 day trip to NYC and I’ll be using my built-in iPhone 4 Google Maps GPS a lot, so I’m in the market to buy an external battery. So with that said, what should I look for when purchasing one? I’ve noticed a lot of these advertise the mAh (milliampere-hour), and then some will also advertise the amperes themselves (i.e. 5200 mAh (2 amps)). What’s the difference when they advertise both?

DVI support is a must and most LCDs in the size that you are looking for are going to have it.
Your MB can drive a display with a resolution of up to 1920 x 1200 which just happens to be the resolution of the 23" Apple Cinema HD Display. I didn't want to pay Apple prices for a display, so I went looking at Dell. I picked up a 20" 2007WFP display from them for about $360 shipped and it works like a charm with the Apple Mini-DVI to DVI adapter.
I prefer displays that use a S-IPS panel over the more common and cheaper TN panels. S-IPS is much better for color reproduction and that is why Apple uses them in their Cinema Displays. Dell uses the same panel is some of their 20" models - I got one - but some buyers are very upset that they got a TN panel instead of the S-IPS panel. I was lucky I guess.

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