1000mAh USB Rechargeable Emergency Power Battery Pack for iPhone/iPod

Pros: Reasonable battery capacity and ability to charge ipod.
Reasonably quick charging time.
Has arrow to indicate rough remaining capacity.

Cons: Alot bigger than expected.
Blocks earphone holes while charging(cannot be used as media player during charging)
Looks very cheap as build quality is thin plastic and light shines through the plastic. Also unnecessary writings on the front of the battery like "test" and "mobile power station"
makes it look cheap.
A better version came out on DX, it has a bigger capacity and is cheaper, but im not sure of how well it functions.

Other: Carries out its function, but has a many hindrances along with it.
Can be a life saver for iphone users that may need to make calls when their phone has run out of power, its also great for traveling.

Pros: Charges quickly using the normal iPod/iPhone cable, from PC or from the wall, and will charge up your phone/iPod a good bit, definitely enough to make some (longer) calls. This is really nice, because as we all know, the iPhone is a bit of a pig on battery life - a few minutes on 3G or WiFi can drop your battery 10-20%. Use this to bring your phone back to life.

Cons: Gets hot. Really hot. So much so that the iPhone's overheat protection kicks in and stops charging. Make sure that you use this in an open environment, i.e. on your desk, car seat, lap, etc and not in your pocket or bag. The product lose 3 points on build quality for this.

Other: Good product, got me out of a jam more than once when my iPhone died.