Peter,Good to see your post. I was told the same thing from engineering at
Nissan when we had the Leaf in 2011. The primary reasoning was to allow for
expansion in hot conditions, preventing ruptured cells, along with the reality
of a customer driving until the battery is totally flat, causing irreparable
harm as well. -Tom True Sent from my T-Mobile 4G LTE Device
-------- Original message --------From: Peter VanDerWal via EV
<[email protected]> Date: 2/4/21 1:29 PM (GMT-08:00) To: Electric Vehicle
Discussion List <[email protected]> Cc: [email protected] Subject: Re: [EVDL]
Pandemic Cell Fade The engineers at Chevy ae well aware of this. The charge
controller in the Chevy volt doesn't allow the batter to fully charge or fully
discharge to prevent this sort of thing from happening. The Volt's SOC guage
shows empty when the battery still have 15% or so left and full when it's at
85-90% SOC.February 3, 2021 6:22 PM, "EVDL Administrator via EV"
<[email protected]> wrote:> Not to be too pessimistic about it (though you
gotta do what you're good at, > and I'm GREAT at pessimism), but some of that
might be actual battery > capacity loss. Lithium capacity loss from long term
storage at high states > of charge does happen, especially at high ambient
temperatures. > > Most production EVs run their batteries in a range that keeps
them well > above 0% SOC and below 100% SOC. I'm not a lithium expert, but I've
read > that the ideal SOC range for storing lithium batteries is around 50-70%.
> I'd estimate that that would be more like 60-80% on the car's SOC meter, >
assuming it has one. > > I wouldn't let it sit undriven and unloved at 100%,
either indicated or > real, and I definitely wouldn't leave it plugged in.> >
Let's hope that most of what you see is just range estimator error, not >
actual capacity loss.> > David Roden, EVDL moderator & general lackey> > To
reach me, don't reply to this message; I won't get it. Use my > offlist address
here : http://evdl.org/help/index.html#supt> > = = = = = = = = = = = = = = = =
= = = = = = = = = = = = = = = = = = = > The problem with the future is that it
keeps turning into the > present.> > -- Bill Watterson, "Calvin and Hobbes"> =
= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = > >
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