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LONDON UK
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anyone tried or even seen them despite their high costs ?
looks like the way to go ,they last 20 years without a re charge ¬
i dont know how common or what price is tritium to make the batteries .
sound s like a job for Doc Oc

$1200 for a unit..phew ,but 20 years usage sounds usefull ...
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NASA use them... They're on Curiosity right now, trundling around Mars.  You might ask them if you can take it for a spin...
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Massachusetts, USA
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$1200 for a unit..phew ,but 20 years usage sounds usefull ...

Unfortunately they only put out 50 to 350 nanoAmps (0.05 to 0.35 microAmps).

http://www.citylabs.net/index.php?option=com_wrapper&view=wrapper&Itemid=20
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Danger Boy
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I prefer mine bigger...

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I have only come here seeking knowledge. Things they would not teach me of in college.

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Show off.

Is that you stood next to it?
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Fort Lauderdale, FL
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So.  Many.  Inappropriate. Jokes.
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Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.c

London
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Show off.

Is that you stood next to it?

Yep. But you can't see him when he hasn't got his bandages on...
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Danger Boy
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That is a NASA physicist or contractor and she is certainly female, no that is not me.  The link is a hot-link to Wikipedia's article on RTGs.

http://en.wikipedia.org/wiki/Radioisotope_thermoelectric_generator
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http://micgadget.com/32782/you-can-easily-buy-an-nuclear-battery-in-china-that-could-last-for-a-thousand-years/
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Let me sell you a pack of "Prosperity Seeds" so you will be rich!
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Danger Boy
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The half life of tritium is 12.32 years.  It's not going to last 1000 years.  After 100 years only 0.36% will remain.  After 1000 years, 3.7E-25.  I'm sure the betavoltaics have a cutoff threshold at some point where there is no voltage despite some residual beta activity.
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