Highlights:
If the Portable Power station 1 is too bulky, and make you not able to take photo while charging.  Then this an external battery probably for iPhone is what you need.

Features:
- Completely integrate as a part of iPhone 2G(see note below)!
- Plug-N-Play
- Portable and Pocketable
- LED indicator for Chargers and powering up your iPhone
- Compact and lightweight
- Additionally dock port for charging the battery directly while charging iPhone

This accessory is compatible with:
- iPhone 3G (or 2.0) (see notes below)
- iPhone 2G (or 1.0)
- iPod Nano 3rd (note the sharp is not that perfect)
- iPhone 3GS (for shipment on/after 28 June 2009)

Specifications:
- Capacity: 800mAh
- Input:  5V, 500mA
- Output: 5V 400mA (max.)

Color:
-Black

Package Contents:
- Portable Power Station 2 (800mAH) for iPhone x 1

Packaging:
- Blister

Note:
- It is said that a standard iPhone built-in battery is a 1400mAh one which means this battery is just an emergency one rather than one that can charge your iPhone to full.
- Physically there will be a small gap between iPhone 3G and the battery but funcationally, it has no problems to charge.  It is fits perfect with iPhone 2G.