1. Overnight if you're able to drive it first thing in the morning as long as the weather is cool. In hot weather, try not to charge to 100%new2meleaf wrote: ↑Tue Oct 22, 2019 10:19 amHi everyone. Just picked up a new to me leaf about two weeks ago and love the car so far! It’s a 2013 SV that came with 82,200 miles and 11 battery health bars.
I did a lot of research and reading both before purchasing and since purchasing the car to determine how to take care of the battery. The problem I keep running into is the answers posted online and the recommendations by Nissan are vague. That’s kind of what I would expect from a car company, keep the recommendations vague so that no matter what, they can say you didn’t correctly follow their instructions.
So here are my main questions, the answers I found, and the questions I still have that I’d love everyone’s help with:
1. How long can you leave your Leaf charged at 100%?
a. Nissan says not to charge to 100% and then let the battery sit fully charged for a long time. Ok, so how long is a long time? 5 hours? 24 hours? A week? A month?
b. If sitting at 100% is bad for the battery, is the negative impact cumulative or does it “reset” each time the battery is used and then recharged? For example, if my car sits 100% charged for 6 hours a day every day for a year, that’s equivalent time wise to 89 days at 100% charge. Is the every day 6 hours just as bad for the car as 3 months sitting at 100%?
2. How low can you let the battery go before it’s a problem?
a. I will never let the car get all the way to 0%, but how low can I go before it could potentially cause damage to the battery pack? I think the lowest I’ve gotten is 15%, but would running it down to 5% be a bad idea as long as I charge up fairly soon?
3. Is DCQC really that bad?
a. Ok, so according to some independent testing, it was found that only DC quick charging and standard level 2 charging are very similar when it comes to battery degradation with a small hit when using only DC quick charging.
b. It seems that the bigger issue is the heat generated during charging. No DCQC when battery temp is 7 bars or higher, maybe OK with 6 bars, 5 bars you are good.
c. Since heat increases and charging efficiency decreases the closer the battery gets to 100%, keep an eye on battery temp when DCQC and maybe avoid going over 80% DCQC when possible. Is this accurate?
Well, the 2012 chemistry was WAY WAY worse than the 2015 chemistry. Having had both chemistries (in my 2011), I can say that charging to 80% spring/summer/fall, storing the car in an air conditioned garage, and avoiding quick charging kept my degradation minimal. In the winter, we did charge to 100% (because cold minimizes battery breakdown and we needed the extra range).Nubo wrote: ↑Tue Oct 22, 2019 2:43 pmAll battery degradation is cumulative. And you won't get definitive answers to effects because of the number of interrelated variables. It seems from evidence presented over time that heat is the largest factor.
Your course of action depends on how much time and inconvenience you're willing to spend to mitigate battery aging. Five years into my 2nd LEAF I'm pretty much of a mind that "just drive it" suffices. I charge to 100% most of the time and sometimes it sits for days. I like having the car as ready as it can be in case I need to use it. Mine is a 2015, 24 kWh pack. As packs get larger, the inconvenience factor of under-charging is lessened. If I had a 40 kWh pack, for example I might endeavor to charge at 80% most of the time. In fact I did so with the 2012 religiously because the timer had a provision to do that easily. Ironically, despite the coddling the degradation of my 2012 was far worse than it has been with the 2015 -- reinforcing my "just drive it" mentality.
What year is the car? If it's a 2011-2012 Leaf (unlikely if 5 years old, I guess!), then it has a battery chemistry that degrades easily, albeit more slowly in cool climates. I don't know when the switch to a better chemistry occurred in UK Leafs - it was in April of 2013 in the US and Canada. Still, leaving any Leaf at 100% charge for long periods, especially in hot weather, will degrade the battery. So will quick charging it when the battery is already hot.Gospelman wrote: ↑Wed Oct 23, 2019 9:56 amAnother Newbie here with a battery degradation question. I've owned my Leaf for just 3 weeks and am delighted with it, coupla days ago I started using LeafSpy Pro and this informed me that my battery's SOH is 83.57%. The car is 5 years old, has travelled 18,500 miles and Spy also informs me that in its life the battery has received 12 QCs and 796 L1/L2s. The climate where I live South Coast England is relatively cool, so what on earth has the previous owner likely to have done to have caused this amount of degradation in so relatively short a time?
Many thanks for any replies.
Check the manufacturer's plate in the door frame. It should have the manufacture date on it. Your car is 5 years old so 83% isn't terrible. With 796 L2 charges and 18000 mi. the car was charged every 22 mi. on average. That battery has probably never been below 60% charge and sat with a full charge most of the time. I'd suggest using the battery a little harder and charging when you get down to 30% or less. Unless you need more range the next day, I'd let it sit at a partial charge.Gospelman wrote: ↑Wed Oct 23, 2019 12:20 pmMany thanks for your swift response. My car was registered new in June 2014 so there's a possibility that it might have the earlier defective chemistry, especially if it had been standing in storage for any length of time. A build date would be useful here. I think we can discount quick charging woes, as it's only had 12 QC's in its life, but your comment on keeping the battery at 100% charge for long periods might well be the reason, especially as the previous owner may have been paranoid about range & keeping the battery fully charged. I don't know who the previous owner is, as the Data Protection Act in the UK forbids the relevant Motor Licensing Authorities disclosing this information to a new owner. I only know that he/she lives in the same town as me because they forgot to clear the memory in the Sat Nav system, a procedure always to be recommended when selling a motor vehicle.