>"The wear using infrequent 63% to 83% was drastically more than tons more cycles from 23% to 83%"

If it wasn't apparent, I had a major wording error, above. The correct wording is:

"The wear using infrequent 23% to 83% was drastically more than tons more cycles from 63% to 83%"

Back when I was first learning Linux, back in the prior millenium, I took one good look at The One True Editor (vi) and knew that I didn't want to waste the time and energy needed to memorize it. Instead, after a little experimentation, I settled on Mork's Editor (nano) and have stuck with it ever since. One of the many things I like about it is that with vi, if you get into it by mistake, it takes you five keystrokes to exit without saving. With nano, if you haven't entered any text, one keystroke (^X, classic geek-speak for Crtl-X) does it. If you've entered some text, but don't want to save it, two keystrokes (^X N) does the trick. As you can see, when working in Linux, KISS is my motto.

I'm still not certain what the "social media" definition is in this or other legislative definitions. Would Usenet count? Would Slashdot? Would some random Phpbb board for bird watchers set up in 2005?

Personally, I've drawn the limit at "algorithms", meaning you get some sort of "feed" pushed down your throat. Whatsapp is not social media - yes, they have channels where you can broadcast but I think the app doesn't try to lure you in. Youtube is kind of borderline - if you log in, it definitely pushes something into your feed, but on the other hand, you do not need to log in, and then you just get "trending" videos. Facebook, Linkedin, X etc definitely count.

In our family, the 10-year old gets access to Whatsapp because all friends have it too. I don't see what would be the point of removing that access. Most of those friendships have formed in school, and when some families have moved away that way they can still keep in touch. They also play Minecraft and Roblox and chat during gameplay. Minecraft is a no-brainer - it's just multiplayer Lego set. Of Roblox I'm not sure but I sure as hell will not be allowing Persona to take some age-verification picture if that ever becomes mandatory.

Also, I can't follow the "no smartphones for kids" train of thought. The smartphone is *easier* to lock down that a dumb (or "feature") phone even with standard Google Family Link tools. Just disable everything except a whitelist. And if child learns how to unlock bootloader and root the phone to get rid of the restrictions, I think I'd feel a bit proud - as long as it's not just done by a geek friend of a friend. Have to at least make some effort...

Wrong! Just because you started out using a GUI and had a hard time adjusting to a CLI doesn't mean that nobody's comfortable working in a text-based interface. Those of us who were using computers back before GUIs were invented find a command line quite comfortable, TYVM!

..creative and motivated kids.
Kids find workarounds and governments are living in a fantasy world

>"Can you provide an example of this in the car industry for batteries? I can only find sensible advice on improving longevity. In fact to go through the GP's example using a Polestar 2:"

Unfortunately, I can't locate the Nissan Ariya example. But I have seen it. I didn't save the document or link. Perhaps this is only limited to Nissan, though.

As for your list- For trip routing, it does use the 80% rule for DC charging stop planning. But there are no warnings about charging more than 80%. And that is mostly about time, because the last 20% takes so much longer. AC charging is not factored in there. And there is no way to limit charging from the vehicle with AC charging. And no advice or warnings, either in the vehicle display nor the manual.

>"Nitpick: No cars on the market rapid charge above 80%. That's also why they quote 20-80% figures for the speed of fast charging."

The Ariya will charge to 100% on a fast DC charger, unless it is the charger that stops the charging. Of course, you can terminate the charge manually at any time from the charger or the vehicle.

>"I wonder how much this is engineering and marketing function."

100% marketing so they can pretend it doesn't matter how it is charged.

>"A percent indicator is something that an engineer decides to show you. It could very well be that they prioritised battery life over total distance and as a result 100% may be the 90% of the competition"

The actual battery size is 91kWh with 87kWh (for the larger version). The % indicator at 100% is 100% of the 91kWh. The reserve is hidden on the low end (based on experiments).

>"But since you're complaining about it it may not be a decision which resonated with users and end result maybe it was a marketing push to add the adjustment back in user's hands"

Users aren't complaining about the reserve. We are complaining about the inability to tell the car to charge only to 70% or 75% or 80% or whatever. When an EVSE is connected, it will always charge to 100%. There is no user option in the Ariya to set a charge percent on which to stop. There is an option to set a schedule based on time, but that is meant for rate metering, as is time-only, not percent. It was clearly a marketing decision. There is even some marketing material implying (but not directly saying) that you can charge to 100% "safely" without "worry." And that doesn't fit the science fact about NMC. I am not sure any other EV does that. Nissan apparently relented and put a charge limiter in the new Leaf, but hasn't updated the Ariya to allow it. And both vehicles use the same battery type and charging techniques.

>"I wonder if anyone has done a teardown to see if 100% was actually 100% or not."

Based on experiments with full charge, full depletion, and then externally measuring charge again in kWh, people have determined that 100% is 100% (or very close).

Yep, Thunderbird. It's awesome, and one of the few OSS projects I've actually donated to.

>"Home come cell telephone batteries never exceed expectations? They usually operate in conditions that are ideal compared to car batteries. Four years with this phone and the battery is at 75% max capacity."

How often are you charging it to only 80%? How often to you charge before hitting 40%? 20%?

My Samsung A52 5G phone is 5 years old now and seems fine. But I also set the charge limiter (80%) on it from day one. And it rarely sees discharge below 50% before it is charged again. I don't use it a lot during the day, though. Also do the same with my Galaxy Tab S9. Also do the same with my Lenovo X13 Gen3A running Linux (via "tlp" https://linrunner.de/tlp/usage... )

Serious engineering tools

>"Many pedelec batteries, but also the Nissan Leaf use Lithium-Manganeseoxide (LiMO) cells."

The original, old, gen 1 Leaf, yes (2011-2017). But that was changed to NMC in gen 2 (2018-2025), but not sure the exact formula. The new (2026+ gen 3) Leaf uses NMC 811 (80% Nickel, 10% Manganese, 10% Cobalt), just like the Ariya.

>"This isn't good advice."

Actually, yes it is, for the majority of EV's. Although it is less relevant for LFP.

>"Know your battery's chemistry"

For sure.

>"and what the manufacturer advises"

Keep in mind (as I pointed out in my post) that sometimes marketing will get in the way of good advice.

>"Did you get your post backwards"

No.

One of the major causes of Lithium-based battery wear (that the user can control) is physical, from the collection and release of the lithium in the anode/cathode. Each time this causes expansion and contraction of the electrodes and the more added or removed, the larger the physical size transformation (and more damaging it is, especially for modern higher-nickel content cells). Narrowing the amount you put in/remove (to a point) will reduce that physical expansion and contraction and extend the life.

Most general info will just show the typical/general 20-80% use that we are all very familiar with (for NMC). And that is good advice. But even narrower is much better. Here is a good video from Dr. Jeff Dahn...

https://www.youtube.com/watch?...

Note the data shown at 5:14. The wear using infrequent 63% to 83% was drastically more than tons more cycles from 23% to 83%. And cooler temperatures (on the next data shown) drastically reduce wear as well. His specific recommendation was to charge at no lower than 45% to no higher then 70% (when possible/reasonable). There is probably a diminishing return with more narrowing.

Here is a longer, older video that goes into a deep dive about microcracking when charging/discharging: https://www.youtube.com/watch?...

>"it is a nissan they were never designed to last that has not changed since their ICE cars"

Compared to *what*? American cars? Kia's? At the price point, they are very realistically reliable (comparable to Honda/Toyota, depending on model). For ICE, they did have a questionable stint with their CVT's, but design corrections caught up.

>"First link references that photoshoped image of a battery replacement fee of 20k. You can tell it's photoshoped as the text on it is cleaner than the creased and crinkled paper."

Might be. But it is not far outside the window of actual expense, at least on the high-side. If you have a large battery (like 87kWh), my research shows it can cost $18,000 to replace (parts and labor for a brand new OEM one) in mine. And some manufacturers might be significantly higher... plus I am sure the price is very volatile.

Of course, most warranties cover many years/miles (8 years/100K miles in my case) and if any care at all is taken to avoid the worst charging/use behaviors, it is extremely probable it will last more than double the warranty.