Alternatives to using electric to charge iphone?

I'm going travelling soon and i won't be able to use a electrical charger i was wondering if there any other alternatives

You can get a case now that clips on to your iphone. Thats an back-up battery. Not sure if that helps.

You can get wind up chargers and torches (flashlights if you're american) which have a charging connector for USB. I don't know how good they are, I suspect not very, but its the only thing I can think of other than extra batteries and charge them all up when ever you get the chance. Or even both.

http://www.ebay.co.uk/...&_from=R40

You can get battery packs from places like Maplin that have a USB output to charge a phone: they generally if fully charged will give a couple of phone charges. Hand cranked wind up chargers are strictly emergency only. The other option is solar panels, again from Maplin or similar. If the phone will charge from a USB on a computer all these options will work, if it's something with a special charger like a early Nokia then it's more difficult

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