Operating at LSC (low state of charge)

[mkhuffman]

That is not correct. 100% displayed is about 96% actual.

I agree. But I was curious about the warnings from the engineer friend and if he meant 90% SOC, or 90% SOCD.

BTW - I charge my phone when it gets to 40% and stop charging when it hits 80%. Same principle, except I am assuming 100% SOCD is actually 100% SOC on my phone. I suppose Samsung could also have a buffer at the top and bottom.

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[RickMachE]

I charge my tablet and phone to 100% daily.

 

[SnBGC]

I agree. But I was curious about the warnings from the engineer friend and if he meant 90% SOC, or 90% SOCD.

BTW - I charge my phone when it gets to 40% and stop charging when it hits 80%. Same principle, except I am assuming 100% SOCD is actually 100% SOC on my phone. I suppose Samsung could also have a buffer at the top and bottom.

It probably varies by device. The larger the battery the more allowance there is for additional buffer space. I presume that is because it's all measured by volts and not actual physical capacity.

 

[tannerk89]

This is purely speculation on my end, but I would think the max charge percentages in the guidelines from the battery engineer are true state of charge. Different manufacturers employ different solutions. Unless he was speaking about the MME in particular. Also, the way Ford engineered these vehicles seems to have met those guidelines in “worst case” scenario of the owner charging to 100% SOCD (92% actual) and depleting to 5% I believe is an actual ~8% true SOC. So if you follow Ford’s recommendations on max charge (90% SOCD) you’re really only charging to ~82% or so and I doubt many people drive down to <10% (~13% actual) regularly, but I could be wrong there.

 

[Billyk24]

I agree with these I want to add one more - Don't charge a freezing battery (below 32ºF/0ºC). The Mach-E should try to warm up the battery first with L2 charging but it's a consideration if you are trying to L1 or DCFC in cold weather. L1 doesn't heat the battery, and DCFC should not be attempted until the pack has had some time to warm up while driving.

Your battery temperature is displayed on dash? If not how do you know how well it is warming while driving when it is below zero F?

 

[RickMachE]

Your battery temperature is displayed on dash? If not how do you know how well it is warming while driving when it is below zero F?

OBD2 device and CarScanner app.

 

[ChasingCoral]

I charge my tablet and phone to 100% daily.

I've had to replace a phone battery, too. I'd rather not have to replace a car HVB.

 

[Studly]

Curious - is that SOC displayed (SOCD), or true SOC? We have a 99 kWH battery, but we are only using 91 kWH of it. So if I charge to 100% SOCD, it is actually pretty close to 90% SOC. And it is not possible for us to charge the MME to 100% SOC.

Th' engineer was looking at my MME GT and recommended to not exceed 90% SOCD, not SOC calculated. Don't overthink it.

The suggestion is to be an advocate to get nearest to 45-65% for all uses. Obviously, many will want to and need to get closer to 0-100% for some uses.

The key here is not to hang in the 80 - 100% range or the 0-20% range for long, or as a regular plan.

Use in the 45-65 is the ideal, and anything outside of that is going to happen, but is less favored.

 

[phil]

I did not pay $60k to become a slave to my car's battery maintenance. Count me with those who say "Just enjoy the car." Life is short.

 

[Woeo]

That is not correct. 100% displayed is about 96% actual.

Isn’t 91/98 [extended battery] less than 93%?

 

[mkhuffman]

Th' engineer was looking at my MME GT and recommended to not exceed 90% SOCD, not SOC calculated. Don't overthink it.

The suggestion is to be an advocate to get nearest to 45-65% for all uses. Obviously, many will want to and need to get closer to 0-100% for some uses.

The key here is not to hang in the 80 - 100% range or the 0-20% range for long, or as a regular plan.

Use in the 45-65 is the ideal, and anything outside of that is going to happen, but is less favored.

Yes, yes. I understand all of that. I asked the question because there is a difference between SOCD and SOC, and some don't understand that. And the original post about the engineer didn't specify.

I always charge to 90% SOCD when local driving and 100% when going out of town. I am not worried or concerned, and I will let it go down to 5% if I need to. In 11 months of ownership, I have never needed to.

I don't like to arrive at 5% anyway because that means I don't have any capacity to go anywhere until I charge first. I don't like that at all. So avoiding going below 10% has nothing to do with battery health for me, and everything to do with driving range when I arrive at my destination.

 

[SnBGC]

Isn’t 91/98 [extended battery] less than 93%?

Yes. But you are talking about usable capacity and we are talking about state of charge. When the EX pack is showing 100% displayed the actual state of charge is around 96%. That is beacuase the lower end buffer remains charged at all times.

 

[SnBGC]

Yes, yes. I understand all of that. I asked the question because there is a difference between SOCD and SOC, and some don't understand that. And the original post about the engineer didn't specify.

I always charge to 90% SOCD when local driving and 100% when going out of town. I am not worried or concerned, and I will let it go down to 5% if I need to. In 11 months of ownership, I have never needed to.

I don't like to arrive at 5% anyway because that means I don't have any capacity to go anywhere until I charge first. I don't like that at all. So avoiding going below 10% has nothing to do with battery health for me, and everything to do with driving range when I arrive at my destination.

And to add to that....if your car is 88 kWh usable then 5% displayed is really about 11% actual so even less to be concerned about since most of us plug in as soon as we park anyway.

 

[mkhuffman]

And to add to that....if your car is 88 kWh usable then 5% displayed is really about 11% actual so even less to be concerned about since most of us plug in as soon as we park anyway.

Back in Feb I got the update that increased capacity to 91 kWh. If you are up to date in FDRS (Feb or later), you also have 91 kWh.

Edit: the additional 3 kWh is below 0% SOCD apparently.

 

[MoonRiver]

No one on on a long trip has time to wait until the battery to cool down before charging, nor can not use DCFC.

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