Willie,
Not dynamically, just a one-time upgrade (dealer visit required).
Many Leaf owners who lost the 4th bar and thought they qualified for the
warranty battery replacement were miffed to see the dealer really
enforcing the Nissan requirement that the warranty will only be honored
after the mandatory re-calibration of the 12 battery bar gauge. Most
owners found out that after re-calibration their earlier 4 bar loser no
longer showed 4 bars lost so they no longer qualified unless they would
again see 4 bars lost on the re-calibrated gauge. The first bar does not
disappear until 15% is lost and each subsequent bar should stand for
6.25% so in theory you need a battery degraded to just over 66% of
nominal capacity to qualify if the gauge will indeed drop to 4 bars
right at that point. But reports I have seen of Ah capacity degradation
suggest that the loss of the 4th bar happens later.
I found it significant that Leafs can lose more than 40% capacity in
about 50k mi while some Tesla drops only 6% in 200k mi.

Of course this is only one sample with a specific usage pattern,
but I highly doubt an expansion of the samples will give different
results, we'll see.

Cor van de Water 
Chief Scientist 
Proxim Wireless 
  
office +1 408 383 7626                    Skype: cor_van_de_water 
XoIP   +31 87 784 1130                    private: cvandewater.info 

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-----Original Message-----
From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Willie2 via EV
Sent: Tuesday, October 04, 2016 11:18 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] To fully charge or not to fully charge that is the
question

On 10/04/2016 12:29 PM, Cor van de Water via EV wrote:
> on the battery as the Leaf *does* degrade its battery by 40% to approx
> 60% capacity in approx 50k mi in warmer climates (that is the point
> where Nissan gives a warranty battery replacement, even though they
> promised 70% but re-calibated the battery to lose the 4th bar around
60%
> capacity and triggering the warranty if it occurs within the warranty
> limits for time and mileage.)
When I first got my Leaf, I was astonished at how crappy the 
instrumentation is/was.  Coming from the conversion world, I expected to

see, or find out, how much energy went into the battery and how much 
came out.  Instead, I had these twelve "bars". Unacceptable 
granularity.  Later, I found the "bars" were not even of equal value.  
After some pondering, I came to the conclusion that Nissan did things in

that way to hide information from their customers.  What other 
explanation could there be?

Even more astonishing is how Leaf owners accept the situation and speak 
of almost meaningless "bars".  I'm not surprised to learn that Nissan 
dynamically recalibrates "bars" to manage their warranty threshold.

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