Why shouldn't I charge my 64 kWh Kona EV to 100% every day?

It’s interesting that even modern small appliances use NiMH rather than LiPo. I would imagine that it’s a cost thing, noting else. It’s unknown if these items use a coulomb-counting charge controller as our EVs and smartphones have, and perhaps are not able to accurately charge to 80% or some other precise level.
My very cheap eBike is the same - the charger power pack connects directly to the battery pack, simply providing 42.0 V, a maximum 4.20 V per cell, limited to 2 amps. I have a second charger that I‘ve adjusted to 4.08 V per cell to limit the maximum charge to a ballpark 85%. The battery is still strong after 4 years.
 
syntaxfx said:
Jeff Dahn's video is general, not Tesla specific (other than mentioning his relationship with Tesla). There is no comparison going on. I recall that AEVA folk were providing similar advice on Li-Ion batteries to members before Tesla Motor Corp existed. They observed that the degradation could be slowed by not charging to 100% all the time. If you want to extend the life of your phone or laptop battery, do the same thing.
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Number one Ev Kona Can't be charged for 100% because software is set 95.5% lot of owners don't know what !!!!!!!!!!!!!!
 
brulaz said:
The 20-80% rule is generally for all Li batteries not just EVs. Some stretch it to 10-90% or whatever.
But, as noted, if you stretch it too far, the number of battery charge cycles can be reduced dramatically.

It seems to me that for battery warranty the EV manufacturers would use their charging software to keep the batteries within some reasonable limits.
And the reported EPA range would reflect these limits. To rely on the user to do this "manually" is nonsense.

Does Tesla or Hyundai really tell it's owners to limit their charge to 80% as much as possible to preserve battery life?
Is it in the manual? Not sure if I would believe what a salesperson says.
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Kona EV 2020 100% charge on dashboard in realty is 95.5% this manufacturer protection !!!! So if charge Kona EV to 80 % on dashboard realistically You charge 76.4 % so pick Your choice .That numbers are realistic !!!!!!!!!
 
JSU said:
Tesla clearly discourages its customers from charging their batteries to 100% unless you are going on a longer journey that requires the extra range. But I do not see any sort of warning/advice from Hyundai about this. I've set the charing limits to 80% (I've never tried charing to 100% yet), but do I really have to? I had a 2017 BMW i3 and I charged to what I believed was 100% all the time, but I had been told that the i3 auto manages and protects it's battery as needed so there's no problem with going to 100%.

Does anyone know if anything like this is documented for the Kona's battery? Am I prolonging the life of the battery by constantly only charging to 80%? Or am I just chopping off 50 miles of range daily for no reason.
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My recommendation is to charge 90%=85.95% if you planning to keep Kona for more then 3 years !!!!!!!!!!!!!!!
 
So, what about this scenario for someone who doesn't have home charging:
Charging about once a week when the battery gets near 20%? Is it best to charge to 100% and maybe be closer to a week and a half or better to go with 80% and be closer to a week?
 
cmwade77 said:
So, what about this scenario for someone who doesn't have home charging:
Charging about once a week when the battery gets near 20%? Is it best to charge to 100% and maybe be closer to a week and a half or better to go with 80% and be closer to a week?
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I would go with 80-90 percent and a week. Charging once a week away from home doesn't seem too much of an inconvenient, at least for me.
 
cmwade77 said:
So, what about this scenario for someone who doesn't have home charging:
Charging about once a week when the battery gets near 20%? Is it best to charge to 100% and maybe be closer to a week and a half or better to go with 80% and be closer to a week?
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Again, it depends on when you plan to use the charge over 80%. The idea is to avoid having the car sitting around for more than a couple of hours with greater than 80% charge. That's how the deposits start to form.
Like you, I typically end up at a fast charger on Saturday or Sunday morning. I charge enough above 8o% to cover my journey home (and using the heater this winter).
 
I've just plowed through this whole thread and I feel I'm exactly where I started from :p

Based on my 27 months experience with my other EV, I've set up my (wife's) Kona EV to charge up to 90% and we will run the car down to about 30% before plugging in again (240v at 32a).

Sidebar question: is there any actual %SOC indication on the Kona (preferred), or is %SOC simply implied by the energy gauge level and the range in km as indicated on the standard instrument panel? Thanks.
 
%SoC is displayed when EV operations are accessed on the console, but is not otherwise available as a default display on the dash or the HUD.
This lack is the primary reason I always run Torque Pro as a 2nd HUD.
 
The SoC (displayed) is intended to accurately indicate available energy capacity, which I understand it does by tracking accumulated energy going in and out of the battery, factored by the relevant efficiencies determined from its own history. I’ve described this in more detail in the torque pro thread.
The GoM will use that information as well as driving history, temperature and current climate settings.
As a personal preference, because the GoM is a moving target I ignore it completely and focus on % charge required per 100km.
 
hieronymous said:
%SoC is displayed when EV operations are accessed on the console
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Thanks! I'll check it out next time I'm fiddling with the settings.

KiwiME said:
As a personal preference, because the GoM is a moving target I ignore it completely and focus on % charge required per 100km.
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Understood.

In my TM3, my personal technique is to simply have %SOC showing at all times, so it becomes a simple "fuel gauge".
 
I'm not sure if your Kona model has a user-programmable "star" button on the centre unit but I set mine to bring up the battery SoC screen.
 
KiwiME said:
I'm not sure if your Kona model has a user-programmable "star" button on the centre unit but I set mine to bring up the battery SoC screen.
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Haha, I had that too until I realized that there is no "home" button. Which makes it a pain to switch to Android auto from the SOC screen or the map screen (when I use AA for music). So I reverted back to having the star work as the home button.

From there is only one tap to the EV menu which shows you the SOC.
 
There is always the Home “button” top left of the screen.

However, at least in my ‘19 Kona, you have to choose between the sat/nav screen or the %SoC screen, so back to TP...
 
On my RHD version the star button is an easier reach than the EV icon, and by feel alone, so I like it set that way. Mine came with a Home button but it seems they repurposed that for NAV versions, which my base model doesn't have.

I also note that the climate controls are focused for LHD, as with RHD they are a bit fiddly. Auto, Off and Driver Only are at an inconvenient reach and illogically arranged. Good thing they gave it a mind of its own as it occasionally switches on by itself.

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I've got a question which doesn't seem to really be answered in the manual....

I see an option to choose between MAXIMUM/MODERATE/SLOW speed when charging off the 240v .....

considering the fact that I usually charge only once a week (maybe in winter it'll be every 5 days)... and I always do it when I get home from work around 6PM and only leave again around 7AM.... would it be beneficial for the battery life to switch my charging to Moderate? (what is moderate or slow by the way on the 240?)
 
It's reduced power, so it charges shower. I cannot remember the exact numbers. It doesn't really make any difference at those speeds. If you have a full level 2 charger at home you're charging at 7.4 kWh (or something like that). Charging shower will not be any better for the battery.

However, if you charge to 100% I would try to make sure it's not charged up and then sitting full all night long.
 
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