Best Practice for battery preservation

ajmartineau

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I only charge to 100% every couple of months to keep the cells balanced. Other than that I keep it between 15-85% actual.
Unbalanced cells can cause your battery to go from 8-12% down to 2% in a flash. I've read reports of this but have not experienced it.
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Yoliber

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I read in Edmunds comparison between the Tesla model Y,3 and Mach-E that Tesla's are the only company that recommends a 90% daily charge. Not mentioned but I think they use a smaller buffer and leave that top 10% for trips. They also mentioned that Tesla is the only electric car they can't hit the advertised rates with (I get 220 miles out of the Sr+). This is good news for me because it looks like the Mach E GT will be on the top of my very short list.
 

machefan

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As a Nissan 2018 Leaf owner, which we all know is fate on wheels with its battery system or lack of one. I can say that after 2 years and not really battery tending all that well it's left with 96% capacity using Leaf SPY. The Leafs we have at work to drive around are the 2015 models which are at 75% and treated like crap when it comes to charing (often DC fast charged). I only trickle charge (LVL1) and let it go to 100% with an anticipated ride ahead of me. If no ride ahead it's 80% etc. I DC fast charge maybe 1 once every few months. So really this hasn't been a big issue for me and I am fine with whatever the MACH has, as long as the battery does not degrade faster than expected or under preform.
 
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DaveHsr

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ajmartineau

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I just had my annual battery inspection at the Mercedes dealer in Bellevue. I'm glad it's free because that place looks like they make a lot of money from their customers. DANG!

Over 5 years and 25k miles my battery has degraded 1.4 kWh. The battery started out at 28.8kWh and is now down to 27.4kWh. I think that is the same as it was last year... I'll have to look it up.
I only charge to 100% a few times a year, just to balance the pack. I have never DCFC this car (it can't DCFC but it can pull 48Amps at 240 Volts). I charge to 80% daily.

I know there are a lot of people on here who have never owned or even driven a BEV. Hope this information helps you out.
 


kdryden99

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QUOTE="SnBGC, post: 40049, member: 892"]
I dont think so on the FFE. The EVCC (Electric Vehicle Computer Controller ) won't allow the TCM (Transmission Control Module) to power the DC to DC Converter which charges the 12v battery. Not while charging on L1 or L2. Is possible on DCFC though.
[/QUOTE]
So you're telling me that the l1 and l2 dont charge the 12v when plugged in via the DC-DC converter?
 

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ChasingCoral

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Ok let’s try this
 

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GoGoGadgetMachE

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Ok let’s try this
that's disappointing and fairly stupid given the massive reserve, and given that they didn't say this before on any of their batteries. ? but I guess it means we have the answer now so we can stop talking about it.
 

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For a different take on this, starting at 6:50 in this video from Engineering Explained, he takes the approach that one doesn't need to worry about the details, just let the car manage the battery. With a big reserve, it's never going to get anywhere close to 100% charged. That's what I plan on doing, just not worry about it.

How Does Brake-By-Wire Work? Plus: Audi e-Tron Sportback Review!
 

GoGoGadgetMachE

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For a different take on this, starting at 6:50 in this video from Engineering Explained, he takes the approach that one doesn't need to worry about the details, just let the car manage the battery. With a big reserve, it's never going to get anywhere close to 100% charged. That's what I plan on doing, just not worry about it.

How Does Brake-By-Wire Work? Plus: Audi e-Tron Sportback Review!
that's been my position on here since this topic came up, but I can see a possible problem. If this document is legitimate, and Ford publishes guidance saying "80%" even if that's clearly idiotic (which it is, given the reserve), and you as an owner ignore it, will that impact the warranty? I don't think we know that yet and I don't think we will know until we see the actual warranty paperwork. (They will have the data from the cloud connected side; they have it today through MyFord Mobile on the existing cars.)
 

zhackwyatt

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that's been my position on here since this topic came up, but I can see a possible problem. If this document is legitimate, and Ford publishes guidance saying "80%" even if that's clearly idiotic (which it is, given the reserve), and you as an owner ignore it, will that impact the warranty? I don't think we know that yet and I don't think we will know until we see the actual warranty paperwork. (They will have the data from the cloud connected side; they have it today through MyFord Mobile on the existing cars.)
Why do you think that is idiotic? If you charge the battery to 100%, then the battery is probably charged at 95% (assuming the buffer is split between top and bottom).

95% is still unpleasant to Lithium batteries.
Ford Mustang Mach-E Best Practice for battery preservation 1602118338299


Clearly the more you stay in the middle the slower the degradation.
 

dbsb3233

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Ford Mustang Mach-E Best Practice for battery preservation 1602118338299


Clearly the more you stay in the middle the slower the degradation.
While I agree that staying in the middle is a little better, that chart is kind of deceiving on the surface. When you normalize each line for the same # of kWh (i.e. same # of miles), there's only slight difference.
 

zhackwyatt

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While I agree that staying in the middle is a little better, that chart is kind of deceiving on the surface. When you normalize each line for the same # of kWh (i.e. same # of miles), there's only slight difference.
Not sure I'm following you.
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