I'm not sure what true SOC the Leaf charges to and calls 100% but on my 2016 Kia Soul EV+ 100% on the display corresponds to 95% from the BMS. The two displays agree at 25% SOC and below that the display SOC is lower than actual. If the relationship is linear then 0% SOC on the display is about 1.7% SOC on the BMS. So, when I charge to full it really isn't full. I still only charge to 80% which is about 76.3% in reality unless I need the extra range.
It is entirely possible that Nissan also does something similar and maybe increased the difference between actual SOC and displayed SOC. FWIW, after 14 months and over 22,500 miles, mostly the I-5 corridor of Oregon and Washington, the BMS reports the greatest cell degradation at 10%. Does the Leaf BMS report a similar number? On Tue, Oct 4, 2016 at 2:21 PM, Peri Hartman via EV <ev@lists.evdl.org> wrote: > Recalibration: that sounds like a breach of contract on Nissan's behalf. > To be positive, overall I think Nissan has done a great job. But in this > case, I'd fight back. When you by a leaf, you sign a contract and > recalibrating the way the battery is measured sounds cleanly like a case of > changing the terms of the contract. (For me, it's moot, I'm only one bar > down.) Unless, of course, the contract states explicitly that the battery > must be measured against the current algorithm. > > Peri > > > ------ Original Message ------ > From: "Cor van de Water via EV" <ev@lists.evdl.org> > To: "Willie2" <wmckem...@gmail.com>; "Electric Vehicle Discussion List" < > ev@lists.evdl.org> > Sent: 04-Oct-16 2:06:10 PM > Subject: Re: [EVDL] To fully charge or not to fully charge that is the > question > > 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 >> >> http://www.proxim.com >> >> This email message (including any attachments) contains confidential and >> proprietary information of Proxim Wireless Corporation. If you received >> this message in error, please delete it and notify the sender. Any >> unauthorized use, disclosure, distribution, or copying of any part of >> this message is prohibited. >> >> >> -----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. >> >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> Read EVAngel's EV News at http://evdl.org/evln/ >> Please discuss EV drag racing at NEDRA >> (http://groups.yahoo.com/group/NEDRA) >> >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> Read EVAngel's EV News at http://evdl.org/evln/ >> Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group >> /NEDRA) >> >> >> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Read EVAngel's EV News at http://evdl.org/evln/ > Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group > /NEDRA) > > -- David D. 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