As I spend many weeks of the year living in a tent I put together this solar powered battery pack and fit it all inside an ammo case. It has more than enough power for light and charging multiple phones and accessories and coupled with a 50w solar panel, is usually fully charged before mid-day in summer, even when it's cloudy.

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** This video is light on details. If you have questions please ask them in the comments but there will be a detailed instructable online soon. Follow me on Instagram and/or Instructables to know when.