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Canon USB/AA battery charger?

I'm looking to do a very long backpacking trip and was wondering if there was any way to charge my camera's battery without being plugged into a wall outlet.

This applies to lots of these bigger batteries, but in this case I'm looking at the Canon NB-7L, that works with the PowerShot series. Litium-Ion, 7.4V, 1050 mAh. As far as I can tell, there is no way to charge this battery without these big wall chargers, although there are some off-brand variations which allow for power from a cigarette lighter adapter.

Anyone have any brilliant ideas on how one would go about getting power to one of these batteries, via charger or otherwise? My main problem seems to be that all the alternative power sources out there (solar chargers, mintyboost, yada) provide their power via USB, which doesn't seem to do me much good. I know there's beefy battery packs out there that would work, but in the interest of saving weight, I'd rather not spring for a brick that weighs more than my tent. Any input is greatly appreciated. Cheers.

You could make some sort of hand cranked generator, with a variable voltage regulator, that way you can charge anything you want. might take a fair bit of winding to fully charge the battery, especially at 7.5 V.