Scaramanga
Well-known member
So your strategy would be to drive it & charge every night up to 100% to see if the SOH comes up?
Scaramanga said:So your strategy would be to drive it & charge every night up to 100% to see if the SOH comes up?
If LEAFspy is to be trusted, my car bucks your advice. I think we charge to 100% perhaps once a month but the max/min cell delta is below 10 mv and often 7-8 mv. And incidentally, despite a very easy driving cycle and gentle climate the battery continues to shed SOH and Ahr by the month.baustin said:But you do need charge it to 100% on a regular basis (not every day) to keep the cells balanced. If your morning drive leaves you at your destination with 80% or less where the car will sit all day, then it is not a problem to charge to 100% daily. I would suggest using a charge timer so that it finishes about 15 to 30 minutes prior to departure (this may need adjusted if you are on TOU rates).
SageBrush said:If LEAFspy is to be trusted, my car bucks your advice. I think we charge to 100% perhaps once a month but the max/min cell delta is below 10 mv and often 7-8 mv. And incidentally, despite a very easy driving cycle and gentle climate the battery continues to shed SOH and Ahr by the month.baustin said:But you do need charge it to 100% on a regular basis (not every day) to keep the cells balanced. If your morning drive leaves you at your destination with 80% or less where the car will sit all day, then it is not a problem to charge to 100% daily. I would suggest using a charge timer so that it finishes about 15 to 30 minutes prior to departure (this may need adjusted if you are on TOU rates).
All quite perplexing.
Now sounds like a good time, before summer. Thanks -- I will.baustin said:SageBrush said:If LEAFspy is to be trusted, my car bucks your advice. I think we charge to 100% perhaps once a month but the max/min cell delta is below 10 mv and often 7-8 mv. And incidentally, despite a very easy driving cycle and gentle climate the battery continues to shed SOH and Ahr by the month.baustin said:But you do need charge it to 100% on a regular basis (not every day) to keep the cells balanced. If your morning drive leaves you at your destination with 80% or less where the car will sit all day, then it is not a problem to charge to 100% daily. I would suggest using a charge timer so that it finishes about 15 to 30 minutes prior to departure (this may need adjusted if you are on TOU rates).
All quite perplexing.
Maybe you could try charging to 100% once a week, and see if it helps any.
baustin said:SageBrush said:If LEAFspy is to be trusted, my car bucks your advice. I think we charge to 100% perhaps once a month but the max/min cell delta is below 10 mv and often 7-8 mv. And incidentally, despite a very easy driving cycle and gentle climate the battery continues to shed SOH and Ahr by the month.baustin said:But you do need charge it to 100% on a regular basis (not every day) to keep the cells balanced. If your morning drive leaves you at your destination with 80% or less where the car will sit all day, then it is not a problem to charge to 100% daily. I would suggest using a charge timer so that it finishes about 15 to 30 minutes prior to departure (this may need adjusted if you are on TOU rates).
All quite perplexing.
Maybe you could try charging to 100% once a week, and see if it helps any.
Seems badrmorgansd said:Is it just me or do you agree this seems bad for a brand new battery?
SageBrush said:Seems badrmorgansd said:Is it just me or do you agree this seems bad for a brand new battery?
Scaramanga said:2016 SL took delivery in December last year, 2400 miles, SOH 93%. Lame.
#1 thing to check both new and used; time on the lot.
An interesting discovery was made by NASA in that Li-ion dwelling above 4.10V/cell tend to decompose due to electrolyte oxidation on the cathode
gshepherd said:We have two 2016 SVs. One was manufactured October 2015, and the other was March 2016. We bought them at the end of May 2016. Both seem to be tracking about the same SOH and have around 4000 miles on the odometers, each. SOH varies from 92% to 95% depending on driving cycles, ambient temperature, etc. Neither one was at 100% charge when we test drove them - more like 30 to 40%. That was Magic Nissan (now Campbell) in Everett, WA. They may well know that you don't store LEAFs at full charge.
Both cars recently had their official battery tests done with flying colors. Interestingly, the metric for "extended storage at high state of charge" (paraphrasing from reports I have seen here) is absent on the 2016. There are only three metrics now listed:
> Frequent charging when battery state of charge is already high.
> Frequent use of Quick charging.
> Too much electric consumption while driving.
When I asked the Nissan EV Help Line about long term storage, I was told to charge the car to 100%, then unplug it. After three months, drive it around a bit, recharge it, and store again for up to three months.
This all conflicts with group-think knowledge here and even in the owner's manual that came with the car, which suggests to use the 80% long-life charge mode before storing the car, and as well not to leave the car at 100% charge for extended time. Of course, the 80% mode is gone in the USA market cars.
Perhaps Nissan is now less concerned with 100% indicated SOC than they used to be. I don't know. In any case, we stored our LEAFs at 60% SOC for the winter with acceptable results. SOH and all picked up right where it left off.
rmorgansd said:From my experience with Li-Ion they don't tend to self-recover a lot. A little here and there but you can't regain capacity similar to when you cycle an old Ni-Cad or Ni-MH. In fact, one of the worst things you can do to Li-Ion is deep discharge then charge to full. You'll get the longest life by keeping it between about 40 to 80%, although we all recognize that doesn't work well in an EV where you want to go on a long trip.
Very interesting report from Battery University on the Nissan Leaf battery where they were studying early capacity loss. They disassembled some batteries and found the problem. They found what I surmised an an earlier post.....that sitting around at full charge prematurely ages the battery. A quote from the report:
An interesting discovery was made by NASA in that Li-ion dwelling above 4.10V/cell tend to decompose due to electrolyte oxidation on the cathode
Entire report can be found here: http://batteryuniversity.com/learn/article/bu_808b_what_causes_li_ion_to_die
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