12V Battery FAQ

[BW-Korben]

Félicitations pour l'article, c'est sûr !!
Nouveau sur le ME mais pas sur les EV.
Tout ce que j'ai lu dernièrement sur ma nouvelle voiture (d'occasion), c'est que Ford est loin d'être aussi performant que GM en matière de gestion de batterie. Ma vieille Bolt 22 était TRÈS performante pour l'entretien de la batterie (chauffage/climatisation principale et charge 12 V branchée), alors je suis étonné que la Mach E simplifie des choses qui devraient être là, juste pour sa propre préservation, c'est le moins qu'on puisse dire. Tout ce que je comprends, c'est qu'ils la font comme une voiture thermique, ne chargeant le 12 V que lorsque le moteur tourne… C'est absurde !
Pas de clé physique pour entrer dans la voiture en panne et accéder au pack de démarrage d'urgence... C'est complètement stupide...
Oui, j'aime vraiment la Mach E par rapport à ma Bolt précédente en ce qui concerne la conduite, l'espace et le style, mais maintenant je dois me soucier davantage de sa santé.
[/CITATION]

Non ce n'est pas une absurdité, juste pour la sécurité, on ne laisse pas charger une batterie 12v quand on n'esr pas la.
Par contre je ne comprends pas pourquoi quand la batterie est défaillante la porte ne s'ouvre pas de l'extérieur ?
Dans mon immeuble si la porte d'entrée na pas plus de courant, la porte reste ouverte simplement encore pour la sécurité.
par contre la difficulté de trouver une solution c'est quand vous avez un accident la porte a toujours du courant personne ne peut vous ouvrir de l'extérieur !

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[TechWhisperer]

Just want to say thank you! I was able to change my battery in around 30 min using the instructions at the beginning.

Wasn't too bad, but wasn't as easy as other cars I've done, including my Bolt EV.

Got the battery from a local dealer for $135, which wasn't bad and it was a fresh battery manufactured this month.

 

[Mikey_B]

I changed mine a week or so ago, took about 30 minutes. For those of us in Europe, unable to walk into Rock Auto or pick up a suitable battery, worth noting that Varta are now making a suitable part and list it as being suitable for Mach-E. Model number is A10 AGM, costs about £100 so a worthwhile saving on Ford's own battery (assuming your local dealer even carries it in stock). Is perfect dimensions, capacity, chemistry etc.

One thing I did note though, on the BMS reset, I tried four or five times unsuccessfully. I then hunted through YouTube and found someone doing it, there was an extra step. After turning on Accessory Mode, I had to press OK on the steering wheel first, and then went through the headlight flash etc. I got the three flashes first time with that extra step in place.

Anyone else having trouble, might be worth a try.

 

[the golden eel]

Just a quick thanks to @Mach-Lee for the 12V write up and replacement instructions. You are a huge benefit to this forum.

My car is just over 3 years old (Sept 22 build date) and I was waffling on replacing now or waiting until spring as >90% of my trips are at least 20 minutes or more, so I assume my 12V battery is a little healthier than many. But a few weeks ago I received a message that an OTA didn't happen because of a low battery. And I didn't feel like dealing with any problems in the middle of a Minnesota winter. So I picked up a battery at my local dealer for $115 and installed without issue.

 

[ruffieuxh]

Many thanks for those FAQ's. Wow! You almost need to study car engineering again to understand the Mach-e LVB charging system! I think it is highly overengineered. Taking a normal 12V lead-acid battery, charging it like an ICE car does and monitor the voltage would be sufficient.

 

[Rt1AWD]

My App told me that battery is not healthy anymore. Just ordered a new one from https://www.rockauto.com/

$123 with tax and shippint

Thank you, Mach-Lee for all your info

 

[Todd44]

Crazy that ford list price is 132, and Rock Auto is similar, yet “discount”auto, OReilly, etc, want 252$.

 

[Space_Pony]

Crazy that ford list price is 132, and Rock Auto is similar, yet “discount”auto, OReilly, etc, want 252$.

The battery from O'Reilly has better specs and warranty.

 

[Todd44]

The battery from O'Reilly has better specs and warranty.

Checked with dealer, they wanted 237$ for the battery, 100 to install. I’d gladly pay the 100 to install if it was priced at 130. Oh well, just ordered one from Rock Auto.

 

[flapjake314]

Hey @Mach-Lee

Do you know if charging the new 12v is part of the service instructions from Ford?

I'm trying to figure out if my service dept will do that if I pay them to do it or if I'm better off doing it myself...

 

[Mach-Lee]

Hey @Mach-Lee

Do you know if charging the new 12v is part of the service instructions from Ford?

I'm trying to figure out if my service dept will do that if I pay them to do it or if I'm better off doing it myself...

If you're asking if there is a procedure in the workshop manual for replacing the 12V battery, the answer is Yes. But it can easily be done DIY as well (see the instructions in the post).

 

[flapjake314]

If you're asking if there is a procedure in the workshop manual for replacing the 12V battery, the answer is Yes. But it can easily be done DIY as well (see the instructions in the post).

No sorry to clarify I'm asking whether there is a line in the instructions requesting the ford tech charge the 12v to full via a battery tender before installing it into the vehicle, since that is part of the DIY instructions you provided (step 2)

 

[Mach-Lee]

No sorry to clarify I'm asking whether there is a line in the instructions requesting the ford tech charge the 12v to full via a battery tender before installing it into the vehicle, since that is part of the DIY instructions I saw

No, that is not a requirement in the manual. A new battery should come already charged to >80% SoC which is sufficient to install and reset the BMS on. HOWEVER, if the battery has been sitting on the shelf for long time, then it should be recharged first (you should recharge lead acid batteries in storage every six months).

The reason I added the recommendation to recharge is become some people were obtaining batteries that had been sitting on a dealer shelf for a year or two without ever being recharged. Typically at low volume EV dealers. A battery sitting for years is likely partially sulfated which will impair the performance of the battery. That is why for maximum performance and the least problems, batteries should be recharged overnight before installation to clear out any sulfation.

If you got a fresh battery that was made only a couple months ago (check the date sticker), then you can just throw it in without charging, reset the BMS, and it will be fine.

 

[flapjake314]

Ok I guess what I'll have to do is look at the sticker on the battery after the dealership installs it?

 

[dtbaker61]

Ok I guess what I'll have to do is look at the sticker on the battery after the dealership installs it?

you are over-thinking this.....

just let the Dealer install the new battery, although if the sticker shows it is more than a few months old you should ask for a note/letter to clarify the start date of the 36-mo warranty.

Regardless.... the easiest way to make sure the 12v is fully charged and de-sulfated is to leave your MME "on" for overnight/24-hrs. Just disable the "auto-off" setting, and leave it on overnight maybe once every 3 months

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