I refer to an Apple patent for kinetic charging: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm

I refer to an Apple patent for kinetic charging: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220120235510%22.PGNR.&OS=DN/20120235510&RS=DN/20120235510?ystfuv http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=H... Another possibility would be solar charging similar to: http://www.seiko-cleanenergy.com/watches/solar/ http://www.seiko-cleanenergy.com/watches/solar/