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The SSMS-2042 is a top of the line spelunking backpack with many high end technological features to allow you to be zealous even more. Spelunkers and Speleologists face many problems when mapping caves, or just exploring on their own time. We have solved many of these with the devices that come with this tough backpack.
Devises such as:
A scanner to scan and map the cave as you walk.
A knee bend charger that charges your electronic devices as you walk.
Don't forget to find some Oolites!

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Goodwin, "Cavers, Spelunkers, and Speleologists" M. Gale Research in Context, 2008

I need to come up with a way to charge electronic devices for up to a full week without sunlight.

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Is there a device that can charge things for a full week already?
Could I use a Water Turbine?
Could I make a knee bend generator?
How much electricity is required to charge devices that long