Showing 89% instead of the target 90%

[ryano7700]

Same thing has started happening to me after 2 years of ownership. I am glad you asked this. I don't know why it didn't happen the other two winters I owned the car (battery getting age?).

And, Rick consistently talks down to people so while it likely isn't personally, it is off-putting. Thanks to MisterSofa for letting me know I can block him.

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[SuzieN]

That's perfectly normal. It used to be that I set mine at 80%. I'd unplug the charger and sometimes see 4 white bars but sometimes only 3. Did it drop from 80% to 60%? Nope. Rounding. It rounded down from 80 to 79, that meant 3 bars instead of 4.

This is why I set my charging at 85%. That way if it adjusts down a bit or the rounding results in seeing less charge I will still have 4 full bars out of 5.

To me 89% and 90% is the same . More trouble asking this question than the 1% lol

 

[GreaseMonkey]

If it weren’t for the colorful people on this forum, I wouldn’t come here as often. It’s what creates the sense of community and makes life interesting.

I noticed the same thing on two different Mach-Es I’ve owned, one of which has 70 miles on the odo.

 

[JJR]

I've got a '22 Premium AWD Extended Range that I've owned for just over 2 years. Roughly 35K miles.

I've always charged in my garage to 90% in the winter, and 80% the rest of the year.

For the first 18 months of ownership I would get in my car in the morning and the HVB would be ready at 80 or 90%. But at some point this summer it was at 79 every morning instead of 80.

This happens at work as well. I have a free L2 charger available, and once my target charge of 90% is reached I immediately go out and move my car. And when I get in the car the battery is at 89%

And one day last week it started at 89 like normal, but then dropped to 88 less than 100 yards from my house. What this means to me is that at some point soon I'm going to start to see 88% in my garage.

Does my HVB sensing need to be reset in some way, or is this what battery degradation looks like?

Just curious if anyone else is seeing this as well.

There’s absolutely no wiggle room in this display. When 90 drops .000001 it shows as 89.

 

[bbulkow]

Why the attitude, Rick?

I know my battery is fine. I never said or thought it wasn't fine. I was just curious if this is how battery degradation manifests or if there is a HVB sensing error that happens over time.

And since you brought up TEMPERATURE, I mentioned specifically in my post that I started seeing this over the summer. So what TEMPERATURE are you referring to?

Jesus you can be insufferable.

It seems possible even the percent was more or less accurate before. Rick has previously stated the process for more accurate measurement of degradation, which probably applies to other systems like percent, of discharging to around 20 percent then a full charge to 100 and leave it on the charger once per month.

I wonder if you do this. I know i didn't since i just have too danged much range and getting down to 20 is something i rarely do.

I think he is touchy about people being focused on the GOM. I know you are posting about the percent o meter, thank you, but i can imaging the continued strain.

There is a sense where a decrease in true range makes it more likely for a small move to trigger that 0.001 percent. If the full range is 300 miles, then it is 294 a year later (2 percent per year has been quoted as expected? With some non linearity?), then a N distance move will be more likely to trigger the percent drop.

Or maybe it was a software update that makes the percent more accurate? In which case we should thank Ford? ?

But it is also the kind of rumor that gets blown out of proportion into an urban legend.... People are worried about degradation.

You didn't say you were worried, but i think people who are even thinking about battery degradation should get a dongle and ask the car directly

Of course, the degradation is also a GUESS so then we have a whole nother stream of posts ?

Be cool...

 

[the golden eel]

Thanks for the replies. I assumed others were seeing this, as my MME is no different than any other.

To reiterate, by no means am I worried about this. Nor do I have any concern for my battery. I didn't bring it up as a complaint - which is why I posted it in the technical section of the forum. I just wanted to see if anyone else had ever noodled on it.

I had a hunch when posting that it has more to do with the HVB sensing drifting than anything temperature related, as I remember my first winter with this car on a handful of days I would see the battery percentage go up to 91% a couple miles down the road after some regenerative braking. And like I said, I noticed this summer that it was never at 90. Based on this I don't see how it could be temperature alone.

I know there is a HVB reset procedure that mach-lee has posted, but IIRC it involves running the battery down <10%, and I'm not willing to do that in the winter for fear of the turtle. I'll have to do it in the spring.

 

[4wheeldog]

Conversely, I usually charge to 85% and when I drive a mile the battery warms a bit and the meter indicates 86%. Either that or it is regen but I drove uphill.

 

[933233311602]

target charge of 90% is reached I immediately go out and move my car. And when I get in the car the battery is at 89%

This has to be trolling.

 

[Thesnowback]

My 23 does the same thing sometimes. Maybe difference in what the charger reads v. what the guess-o-meter is reading. Software version bugs or just that the world is an imperfect place. Ford software. Not sure which, but pick one.

 

[Mach-Lee]

I know there is a HVB reset procedure that mach-lee has posted, but IIRC it involves running the battery down <10%, and I'm not willing to do that in the winter for fear of the turtle. I'll have to do it in the spring.

You can park it and use MAX Defrost to run it down at the end you're worried about the turtle.

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