Simple, The EPA calculated the Leaf range based on the average of charging to 80% and 100%. Totally crazy, because anybody needing max range would charge to 100% but that was why Nissan removed the 80% option, even though customers wanted to keep it. I always charge to 80% to be gentle 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.) Last week I saw a report from Tesloop (shuttle service LA <==> Las Vegas in Model S) who always (daily) charge to 100% and saw 6% degradation over 200k miles of service in their first car, so quite a difference!
I have a 2011 and can charge to 80% except for the rare occasion that I need the full range. I still see capacity loss by reading the measured Ah battery capacity from the BMS. 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 Corbin Dunn via EV Sent: Tuesday, October 04, 2016 10:15 AM To: Mark Hanson Cc: Electric Vehicle Discussion List Subject: Re: [EVDL] To fully charge or not to fully charge that is the question Yeah, I don't know why they would change their recommendation; people might have been complaining about the limited range when only charging to 80-90%. corbin > On Oct 4, 2016, at 10:12 AM, Mark Hanson <mhan...@hughes.net> wrote: > > Thanks Corbin > If that's the case I wonder why Nissan dropped the less than 100% requirement from the newer 2014 and up vehicles? I guess I don't understand why fully charging and equalizing the cells would hurt battery life. Maybe just a hang on from the lead days :-). > Mark > > Sent from my iPhone > >> On Oct 4, 2016, at 10:25 AM, Corbin Dunn <cor...@corbinstreehouse.com> wrote: >> >> Lithium cells (of all chemistries) seem to have the fastest degradation when they are charged to 100% on a regular basis. The general consensus is to keep it in the 20-90% range. This is also what Tesla recommends for the Model S / X. >> >> I've also been charging my LiFEPo4 cells in my VW bug to 100% on a regular (near daily) basis. I've had a few cells prematurely die; like loosing 30-40% capacity (200Ah thunder skys). The others seem "okay", but some are dipping lower in voltage under load, and probably have lost some capacity; I've been charging them up a bit with a single cell charger, as balancing at the top seems too rough on the cells. I've also got about the same mileage: 46,000. >> >> corbin >> >> >>> On Oct 4, 2016, at 7:19 AM, Mark Hanson via EV <ev@lists.evdl.org> wrote: >>> >>> Hi folks >>> In my 2013 leaf manual it says to not fully charge each cycle and only to 80 percent is preferred but in 2014 it became ok to fully charge. The chemistry is the same NMC nickel manganese cobalt cathode with a lithium electrolyte and a graphite anode. So did Nissan get it wrong? Is it ok to plug it in on short 15 mile trips each time? I do that on my Ghia that has 45k miles on LiFePo4 batteries and still ok equalize on each charge with balancers like the Leaf does. >>> Best regards >>> Mark Hanson >>> >>> Sent from my iPhone >>> _______________________________________________ >>> 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)
