I think your comparison is a little misleading in this context.
If you assume that the amount of gold used is the same as amount of silver used 
(it's actually much less), then using gold is actually *cheaper* than using 
silver if the battery lasts 400 times longer.
Of course, this is initial research only, so the relative costs don't really 
mean anything at this point.

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 From: EVDL Administrator via EV <ev@lists.evdl.org> To: Electric Vehicle 
Discussion List <ev@lists.evdl.org> Subject: Re: [EVDL] 2nd life for lithium 
batteries Date: 10/14/16, 8:36 PM

 
On 14 Oct 2016 at 17:33, Jorg Brown via EV wrote: 
 
> researchers at UC Irvine have used gold nanowires [in a battery] ... 
 
And I thought silver-zinc batteries were too expensive to be practical.   
 
Silver : $561.67 per kg 
 
Gold : $40,284.86 per kg 
 
Yikes. 
 
David Roden - Akron, Ohio, USA 
EVDL Administrator 
 
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