On 17 Oct 2016 at 16:47, Bill Dube via EV wrote:

> Edison (nickle/iron) cells have pretty much infinite cycle life:

So I've read from many sources.  There is lots of evidence to support this.

As I understand it, the "metal" in nickel metal hydride cells is -- guess 
what -- iron.  So if NiFe can have such an extended cycle life, why can't 
NiMH?

In fact, NiMH can have outstanding cycle life.  Consider those remarkable 
Toyota RAV4-EVs from 15+ years ago, with Panasonic NiMH batteries lasting 
well over 100,000 miles.  

Don't you wonder if maybe NiMH could have cycle life approaching that of 
NiFe, if they were designed for it?  

And haven't the patents encumbering the manufacture of large, BEV-sized NiMH 
modules expired now?  

David Roden - Akron, Ohio, USA
EVDL Administrator

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