On 10/17/2016 1:22 PM, Jukka Järvinen via EV wrote:


So no one would mind having infinite battery. It's something we should
invent. :)

-Jukka

Edison (nickle/iron) cells have pretty much infinite cycle life:
https://en.wikipedia.org/wiki/Nickel%E2%80%93iron_battery

However, "eternal" cycle life comes with other baggage:
 Pathetic charge/discharge efficiency = ~70%
 Mediocre specific energy = ~20Whr/kg
 Tepid specific power = ~ 100 W/kg
Painful self-discharge = ~25% per month (This, coupled with the poor specific power, is why they aren't used as starting batteries.)

Edison cells have the distinct advantage of containing no toxic metals, which is a very positive aspect.

Bill D.
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