If I could choose one peice of technology, other than those already in my psk/edc/bob...., to bring with me it would be my kindle. I have tons of books, some technical/survivalist.. Once the battery dies, which does take a while, what could you suggest to re-charge it?

There are some duracell chargers that convert AA to usb... Or what about battery packs, solar power? Its one of those; "would be nice" items and any input would be helpful