Preventative replacement of 12v battery?

[PharaohHound138]

My 2022 MME GT is now 3 years old with just over 20k miles. I need to take it to the dealer for a recall and state inspection tis month. Should I preemptively replace the 12v battery for safety sake? While we don't usually travel very far from home I'd hate to be locked out somewhere.

Absolutely! An ounce of prevention....... It is a fairly simple replacement also.

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[SummerlinBob]

When my 2021 hit the 34-month mark, I got a check 12v battery alert, I brought into the dealer for that and another issue and they replaced it at no charge. Not certain why they didn't pro-rate it but I didn't ask why. If I buyout my 36-month lease on the 2023, I plan on replacing the 12v battery as a PM measure.

 

[Maquis]

Unfortunately, this is not accurate. There have been many instances of 12v batteries dying without the car giving any warnings at all. This happened to me in my old Tesla and I have heard this has happened to some MachE owners as well.

The warning message was only rolled out relatively recently. I’m not sure we have a documented case of a sudden, unannounced failure since then.
Mine failed without warning exactly 1 year ago, before the warning capability was implemented.

 

[Fremont Kid]

Many LVB threads if you want more information. Consensus is 'Yes' to replace the battery on schedule. It may last many more months but taking that risk is most likely not prudent.

I will say that the system generated a low LVB warning when the car was not plugged in for over a week when we did not drive much. Since then we plug in at least once per week, and every night in the winter to ensure the HVB remains above freezing.

Oh, a couple more items:

• When the LVB is replaced, be sure to run the calibration process, otherwise the system may not assess the SOH correctly.
• Replace with the same amperage and chemistry battery. The SOH system may read a different battery incorrectly, thus possibly generating erroneous messages.

 

[Mach-Lee]

I have a 2022 GTPE and im on stock battery still. I was curious about the 3 year timeline so I got an ODB2 scanner with car scanner app to read the 12V battery SOC. Just installed it yesterday and this is what I saw, 63% soc.

I then took a multimeter to the batter (after letting it rest overnight) and this is what I read.

I don't know when the battery warning is going to go off but I'll keep monitoring it. I have a spare battery just in case I need it.

Remember if you are checking battery voltage, you have to open the hood and walk away for 30+ minutes to let the car go back to sleep. If you walk up with your phone or key fob in your pocket it will wake up the car and cause the voltage reading to be low since the car is using 12V power.

 

[RickMachE]

When my 2021 hit the 34-month mark, I got a check 12v battery alert, I brought into the dealer for that and another issue and they replaced it at no charge. Not certain why they didn't pro-rate it but I didn't ask why. If I buyout my 36-month lease on the 2023, I plan on replacing the 12v battery as a PM measure.

For 3 years, the battery is full covered, that's why they replaced it. If you buy a new battery from Ford, that is covered for 3 years also.

The replacement you got is covered for 12 months I believe.

 

[SummerlinBob]

For 3 years, the battery is full covered, that's why they replaced it. If you buy a new battery from Ford, that is covered for 3 years also.

The replacement you got is covered for 12 months I believe.

Thanks, that's good to know when the 2023 is due.

 

[EB87]

My 2022 MME GT is now 3 years old with just over 20k miles. I need to take it to the dealer for a recall and state inspection tis month. Should I preemptively replace the 12v battery for safety sake? While we don't usually travel very far from home I'd hate to be locked out somewhere.

Yes. 12v battery isn’t that expensive. Do it for peace of mind.

 

[Roomba]

Remember if you are checking battery voltage, you have to open the hood and walk away for 30+ minutes to let the car go back to sleep. If you walk up with your phone or key fob in your pocket it will wake up the car and cause the voltage reading to be low since the car is using 12V power.

Ahhh, I didn't know that! So if I walk up to my car, unlock my car via keypad, I have to let it sleep in 30+ minutes? Even if the phone was never on me?

What I did was walk to my car (without phone), unlock frunk and measured the voltage. I was missing the "let it sleep" step

 

[HuntingPudel]

Ahhh, I didn't know that! So if I walk up to my car, unlock my car via keypad, I have to let it sleep in 30+ minutes? Even if the phone was never on me?

What I did was walk to my car (without phone), unlock frunk and measured the voltage. I was missing the "let it sleep" step

Using the keypad wakes the car so that the car can unlock the doors. So, after that you need to let the car sleep again after the frunk is open.

 

[Roomba]

Got it! Haha. Either way, the OBD2 mentions that I have 63% soc left so I'm still OK for now

 

[Jon Boy]

Mine failed at 14200 miles, no warning given (MY23) dealer changed F.O.C

 

[RickMachE]

Got it! Haha. Either way, the OBD2 mentions that I have 63% soc left so I'm still OK for now

You were at 63% then. It could be 90% now...

 

[Kamuelaflyer]

You should get ample warning when that becomes necessary

Should. Should is also not synonymous with will.

Unfortunately, this is not accurate. There have been many instances of 12v batteries dying without the car giving any warnings at all. This happened to me in my old Tesla and I have heard this has happened to some MachE owners as well.

There are more than a few threads about sudden 12v failures. The advanced warnings may have mitigated that somewhat, but it doesn’t change the fundamental nature of the 12v battery, its use or operating conditions.

 

[ipca204]

Yay! Another 12v battery thread! Lifeblood of the forum!

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