Showing 89% instead of the target 90%

[the golden eel]

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.

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[RickMachE]

Yes, everyone. ROUNDING. TEMPERATURE.

Your battery is fine.

 

[Scooby24]

When it gets cooler you charge to 90% and it hits 90% while the battery is warmer as a result of the charging. Then you stop charging and it cools down a bit and your capacity in the battery drops and your percentage as a result is a bit lower. This is operating as normal.

 

[Justconn1]

Same here. I think it hits exactly 90 and then stops. So if you turn the car on, pull away and use some energy it drops just below 90% immediately. Hence 89%. This was my total layman's guess using my extensive Mach E logic Ford has tough to me. And yes I never noticed it until about 6 months ago.

 

[Justconn1]

Or what Scooby said makes total sense. Bottom line, a percent in a guesstimate is just that.

 

[the golden eel]

Yes, everyone. ROUNDING. TEMPERATURE.

Your battery is fine.

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.

 

[ChasingCoral]

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.

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.

 

[Herbknowsit]

Don't take it personal. If RickMachE wants to get a little cranky let it ride. I've learned more from him in my 8 months of MME ownership than any other forum member. He reminds me of a law professor I once had that knew damn well you didn't read the chapters in the book he assigned (and also authored) so he would remind you to do your homework prior to class. However, I will add as a newbie to this forum, sometimes I was hard pressed to properly phrase a question so the "search" feature didn't pan out well at times. So I'd put a post in play and lo and behold, posters would come to the rescue and yes, the question/topic had indeed already been in play previously.

 

[MisterSofa]

You can always block DickMachE.

 

[CarlSagan82]

Showing 89% instead of the target 90%

 

[dabois89]

It happens to me all the time, ill get out to the car be told its 89% when set to charge to 90%. Kind of annoying because sometimes i like to play a game in the morning to see how little battery % i can use getting to work. (A way to help the drive to work not be so monotonous).

 

[Scooby24]

You can always block DickMachE.

He apparently blocks others as well as I never can see his posts anymore...I don't even know what I would have said to have him block me but hey...no complaints!

 

[Sikkun]

Sometimes it goes down 1%, sometimes it goes up 1%, sometimes it stays the same.

 

[Mach-Lee]

The charge termination gets more messed up when the battery is cold because the battery internal resistance is higher. Which results in a greater voltage relaxation after charging and larger percentage drop when you start out.

It’s basically normal because of temperature differences. I typically see a 1-3% drop in the winter in the first mile.

 

[Monke]

This happened to me countless times. After driving for a mile or two, the number came back up to 91%. It is a GOM.

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