External USB batteries

I can at least vouch for this one: http://www.amazon.co.uk/PowerGen-8400mAh-External-Battery-output/dp/B0073F92OK/ref=sr_1_17?s=electronics&ie=UTF8&qid=1378895115&sr=1-17&keywords=external battery pack

I've had it for almost a year and it's been fantastic (I had the smaller version [http://www.amazon.co.uk/PowerGen-Ex...895115&sr=1-22&keywords=external+battery+pack] for over a year but gave that to my brother since I needed more battery capacity and that one was also good).

And then there's an even bigger one but I don't know about that (has good reviews though http://www.amazon.co.uk/PowerGen-PG...8895115&sr=1-9&keywords=external+battery+pack)
 
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