6000mAh Rechargeable Portable Emergency Power with Phone Adapters

Pros: Good build quality and comes with a nice case.
Contains adapters to charge different devices.
I was able to charge my HD2 more then 4 times.

Cons: The on/off button is somewhat hard to press ( it extends very little from the surface)

Other: Nice to have if you need to charge your power hungry cellphone/mp3 player or other gadget.
Good build quality and comes with a nice case.
Contains adapters to charge different devices.
I was able to charge my HD2 more then 4 times.

Pros: Very good build quality; Fully charges Samsung Galaxy SII up to three times; Several adapters for various devices; Possibility to simultaneously charge the power bank and your phone from one USB-adapter; Handy and good looking storage case.

Cons: Perhaps too heavy to carry in a pocket; No adapter for iPhone/iPad (but you can still use the original Apple USB-30 pin cable); No AC-to-USB power adapter included (but you can use any such adapter from any other device).

Other: A must-have for travelling owners of power consuming devices, such as SGS2 or iPhone 4.