Here's how in 30 minutes and only $5 you can convert a simple house clock to solar power so you never have to replace the batteries again.
instructions in the video, very basic electronics knowledge needed, basic soldering needed.
mini-solar panel from Ebay:
http://cgi.ebay.com.au/2-0V-160mA-0-32W-SMALL-MINI-PV-SOLAR-POWER-PCB-PANEL-X...|65%3A1|39%3A1|240%3A1318
search on Ebay for "mini solar panel".
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