1900mAh Rechargeable External Battery for iPhone 4/3G/3GS (Black)

Pros: Reasonable price and capacity. Instructions were almost understandable. Visual capacity indicator seems to work. Has some sort of stand thing at the back, I think that is a pro...? It works with my old ipod touch.

Cons: Does not work with iphone 4, and unfortunately this is the main reason I bought it. I repeat it does not work with IPHONE 4 even though the description says it does.

Other: Really should work with iphone 4 if description says it does.

Pros: Small and lightweight You can use your iPod even if the battery is completely drained out. Blue light battery indicator

Cons: Delivers only one full iPod charge, you need to recharge the external battery if you want to use it again. Packaging states "Aluminium cell battery". On the battery itself says "Li-ion"...

Other: Cheap battery delivers one charge when fully charged. You need to pay attention to the icon on your Ipod to make sure it´s charging, sometimes takes more than one try to make it work, but it works. My iPod is a 1st gen 16GB touch device.

Pros: This works well with my iPhone 3G. I carry one of these in my car for emergencies. Even being stored in a hot car, it will hold its charge for months. Although it has enough juice for only 1 charge, that always has been enough to solve my immediate need. And, the battery is small and light enough that you can continue to use your phone while it is charging.

Cons: None

Other: This is a very good value and can be a great help in time of need.