realestatetomtom
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Will charging my battery to the full 100% for 2 days a week and charging it to 80% for the remaining 5 days have much effect on the length of the life?
Maybe. But Tesla is a different chemistry. So far from certain.Stoaty said:Data from Tesla forums suggests that it is time and temperature at full charge that shortens battery life.
Mark Perry confirmed this when someone asked him while we were standing in front of the room after the SF BayLeaf meeting was over (where the chief vehicle engineer, a bunch of engineers from Japan and some pretty senior Nissan folks were present but elsewhere in the room). I heard this straight from his mouth.TimLee said:Nissan indicates 80% charging will help reduce battery capacity degradation.
davewill said:It may, but what good is a car that you can't drive when you need it? I say if you know that you can get by on 80% then charge to 80%, and if you might need 100%, then charge to 100%. I do almost the same as you do, 4 day at 80% and 3 days (Fri-Sun) at 100%.
You may be right, but that article is clearly about small batteries used in cell phones, etc., not about EV batteries. The chemistry is different and, perhaps most important, there is no way you can charge a LEAF battery to a true 100%. What carwings and the dash calls 100% is almost certainly no more than 95% of maximum capacity; probably less than that.ebill3 said:Charging to less than 100% will increase the number of usable cycles.
Take a look at this reference: http://powerelectronics.com/portable_power_management/battery_charger_ics/804PET22li-ion-battery-life.pdf" onclick="window.open(this.href);return false;
Oh, I agree that we never truly charge to 100% (4.2 volts/cell), as that would be 403.2 volts on the SOC meter. The most I have ever seen after a 100% charge is 392.5 which roughly equates to about 97%.planet4ever said:You may be right, but that article is clearly about small batteries used in cell phones, etc., not about EV batteries. The chemistry is different and, perhaps most important, there is no way you can charge a LEAF battery to a true 100%. What carwings and the dash calls 100% is almost certainly no more than 95% of maximum capacity; probably less than that.ebill3 said:Charging to less than 100% will increase the number of usable cycles.
Take a look at this reference: http://powerelectronics.com/portable_power_management/battery_charger_ics/804PET22li-ion-battery-life.pdf" onclick="window.open(this.href);return false;
Good call, Ray. If this research report for LiMnO4 spinel cells applied to the Leaf, we can be nearly certain that a full charge at 4.10V cell voltage corresponds to about 90% of its rated capacity. Conversely, 80% charge at 4.05V cell voltage corresponds to about 75% of its rated capacity, or perhaps a bit less than that. Although the basic cell chemistry is an exact match, it's difficult to come up with precise estimates, since the AESC cells in the Leaf could have slightly different discharge characteristic.planet4ever said:What carwings and the dash calls 100% is almost certainly no more than 95% of maximum capacity; probably less than that.
TimLee said:No real data yet to know.
Nissan indicates 80% charging will help reduce battery capacity degradation.
Multiple other topics on this, but no real answers yet.
We'll know in 2 to 4 years.
For the time being, I use 80% charging when it is feasible. Probably charge 100% less than 5% of the charges I've done so far.
read the section in the manual about how to set charging timers.planet4ever said:You may be right, but that article is clearly about small batteries used in cell phones, etc., not about EV batteries. The chemistry is different and, perhaps most important, there is no way you can charge a LEAF battery to a true 100%. What carwings and the dash calls 100% is almost certainly no more than 95% of maximum capacity; probably less than that.ebill3 said:Charging to less than 100% will increase the number of usable cycles.
Take a look at this reference: http://powerelectronics.com/portable_power_management/battery_charger_ics/804PET22li-ion-battery-life.pdf" onclick="window.open(this.href);return false;
Ray
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