Water meters that my current company makes include a 20 year battery.   Since 
you have no moving parts,  seems similar.

 A quick search shows a few places that make the batteries: 

You could try contacting one of the manufacturers.  Considering the purpose for 
the project and a one off role,  They might provide one in turn for including a 
logo or some promotion on the project.    One of the links included a UK url 
(www.tadiranbatteries.co.uk ) which I think may be near where you are located.

Ken Fallon – Sat, 10. March 2018 8:32
> Hi All,
> My brother in law (The guy who wrote one of the alternative outros) is a
> art teacher in a school. They are making a time capsule to be open in 12
> Years, containing stuff from the kids.
> He wants a transparent tile in the school ground with a countdown timer.
> I was thinking of an arduino but was a bit stumped on how to provide
> power to the thing for 12 years, and to keep it dry.
> I was thinking of getting a solar panel/battery from Ikea, an Arduino,
> and an eink display. And potting the whole thing in transparent epoxy ?
> -
> www.ikea.com/gb/en/products/lighting/decorative-lighting/solarvet-led-lighting-chain-with-24-lights-outdoor-solar-powered-art-30299292/
> - www.waveshare.com/4.3inch-e-paper.htm
> Comments please.
> -- 
> Regards,
> Ken Fallon
> kenfallon.com
> hackerpublicradio.org/correspondents.php
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