2019 Leaf Charge Timer Bug

[henrydehoja]

Where in the manual does it say not to charge to 100%?

I maybe misunderstanding your question, but I am not aware of any place in the 2018 manual that says not to charge your car to 100%.

 

[LeftieBiker]

Where in the manual does it say not to charge to 100%?

Ever since Nissan got penalized by the EPA for the 2013 Leaf's "Long Life" 80% charge limit option, they have carefully refrained from suggesting that charging to 100% is anything but Fine. It is not, however, unless you plan to drive the car soon after charging finishes. That's just how lithium batteries work: anything above 90% SOC or so and degradation is somewhat accelerated.

 

[cwerdna]

Where in the manual does it say not to charge to 100%?

'11 to '13 Leaf have all sorts of verbiage in their owner's manual about essentially avoiding prolonged high state of charge, not charging if already beyond a certain SoC, etc.

Then, when the US '14 Leaf came out where the 80% charge limiter was removed, most/all of the verbiage disappeared from the manual. Yet, as far as we know, there were no chemistry changes between 4/2013+ built '13 Leafs and model year '14 Leafs nor any BMS behavior changes. Will post manual references later today.

https://insideevs.com/2013-nissan-leaf-rated-at-75-miles-but-84-miles-using-the-old-system/
https://insideevs.com/2014-nissan-leaf-mostly-unchanged-as-range-technically-moves-up-to-84-miles/

There's plenty of literature to suggest that prolonged high SoC isn't good for li-ion batteries (unlike lead-acid), esp. in high temps. Unfortunately, these aren't for the specific variant that Nissan uses.

https://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
https://batteryuniversity.com/learn/article/how_to_store_batteries

You can see Elon's tweets at https://insideevs.com/teslas-new-stance-on-charging-habits-elon-responds-video/.

 

[SageBrush]

My Tesla Model 3 warns me not to routinely charge to 100%. If it is bad for the Tesla battery, just imagine what that sort of charging does to the Nissan pack.

 

[cwerdna]

Where in the manual does it say not to charge to 100%?

'11 to '13 Leaf have all sorts of verbiage in their owner's manual about essentially avoiding prolonged high state of charge, not charging if already beyond a certain SoC, etc.

Then, when the US '14 Leaf came out where the 80% charge limiter was removed, most/all of the verbiage disappeared from the manual. Yet, as far as we know, there were no chemistry changes between 4/2013+ built '13 Leafs and model year '14 Leafs nor any BMS behavior changes. Will post manual references later today.

https://insideevs.com/2013-nissan-leaf-rated-at-75-miles-but-84-miles-using-the-old-system/
https://insideevs.com/2014-nissan-leaf-mostly-unchanged-as-range-technically-moves-up-to-84-miles/

There's plenty of literature to suggest that prolonged high SoC isn't good for li-ion batteries (unlike lead-acid), esp. in high temps. Unfortunately, these aren't for the specific variant that Nissan uses.

Ok. See pages
EV-24 of https://owners.nissanusa.com/content/techpub/ManualsAndGuides/LEAF/2013/2013-LEAF-owner-manual.pdf.
EV-23 of https://owners.nissanusa.com/content/techpub/ManualsAndGuides/LEAF/2012/2012-LEAF-owner-manual.pdf
EV-23 of https://owners.nissanusa.com/content/techpub/ManualsAndGuides/LEAF/2011/2011-LEAF-owner-manual.pdf

vs,
EV-24 of https://owners.nissanusa.com/content/techpub/ManualsAndGuides/LEAF/2014/2014-LEAF-owner-manual.pdf

And, remember back in model year '13 and '14, 75 miles on the EPA test and on the Monroney sticker didn't look side good vs. other sub-100 mile EVs available then but 84 miles looked a lot better. Probably 90+% of people shopping for a sub-100 mile EV wouldn't know the 80%/100% backstory.

 

[lorenfb]

That's just how lithium batteries work: anything above 90% SOC or so and degradation is somewhat accelerated.

That's a realistic way to express it.

 

[JeffInCO]

Has anyone figured out a solution for the 2019 Leaf charging to lesser than 100%?

With my 2015, I setup the timer with no start time and an end time of an hour or so later than my planned departure, which worked pretty well for targeting around 80%. Of course, if I didn't actually unplug at the planned departure time, then the car would go ahead and charge to 100%.

Looks like the best bet is the "full charge has priority" feature as was mentioned in this thread, but has anyone figured out the method to its madness? The earlier posts in the thread seemed to indicate that "full charge has priority" wasn't behaving predictably.

Thanks,

Jeff