Portable/emergency battery packs?

[smartiekins]

I'm not quite sure what to call them,but does anyone have a sort of power pack that they can use to recharge their phone if they are away from electricity? I have a HTC one v, and I can get the battery to last a couple of days (or longer if I barely use it), but I have a couple of camping trips coming up, so I'd like to have a way of being able to top the battery up while away.

I've seem solar power ones, but these are often pretty big, which isn't great for me as I try to pack pretty light. I've also seen ones that take AA batteries, and ones that you charge up in advance. Does anyone have any experience with these?

 

[FishenFool]

I use a Mophie Powerstation. It is 4000mAh and charges at 2.1 amps and is about the size of a deck of cards. 79.95 on Amazon or 60.00 at Sam's Club.

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[smartiekins]

I didn't mention I am from the UK.

I've been browsing Amazon, and debating this one, it seems a pretty good price! http://www.amazon.co.uk/gp/aw/d/B00...ag=hawk-future-21&ascsubtag=UUacUvbUpU2873637
Plus, with the capacity I could use it for my iPod too over say a week camping trip

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