12V Battery Replacement

[Jerrytball]

Car Scanner shows 12v voltage just fine.

I’m not saying that because mine shows 14 point something. I’m saying the state of health like the percentage like where did it go on the Ford webpage it used to show us our battery percentage that’s not there anymore. Unless you can tell me where it’s at I don’t see it.

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[RickMachE]

I’m not saying that because mine shows 14 point something. I’m saying the state of health like the percentage like where did it go on the Ford webpage it used to show us our battery percentage that’s not there anymore. Unless you can tell me where it’s at I don’t see it.

Yes, Ford.com no longer shows it. Car Scanner shows it just fine.

 

[Jerrytball]

Yes, Ford.com no longer shows it. Car Scanner shows it just fine.

I’ve gotta look then, thank you.

 

[Jerrytball]

I’ve gotta look then, thank you.

Yes, Ford.com no longer shows it. Car Scanner shows it just fine.

I’m sorry if you can show me the title of it unless it’s something different. I would think it would say state of health low level or EV battery. I’m not seeing any of that all I think I’m seeing is for the big battery and it just shows the voltage of the 12 V battery, but I don’t see the percent remaining.

 

[Jerrytball]

Yes, Ford.com no longer shows it. Car Scanner shows it just fine.

Someone on the Volkswagen forum was asking about the same thing and they were showing a screenshot This in the Car Scanner app? I’m not finding any of this gate stuff

 

[dtbaker61]

I’m not saying that because mine shows 14 point something. I’m saying the state of health like the percentage like where did it go on the Ford webpage it used to show us our battery percentage that’s not there anymore. Unless you can tell me where it’s at I don’t see it.

the SOH% is for the HV battery only, and only visible via ODB2 with an App like CarScanner.

The Fordpass webpage was displaying SOC% of the 12v battery for a while, but that was "fixed" to show SOC% for the HV battery.

SOC% for the 12v is largely irrelevant, and will swing considerably in normal use between 12.4 and 14v. It is important to drive around long enough, or leave your MME "on" overnight, every month or two at a minimum to give the 12v time to charge up to 95+% to desulfate, and have charge on board for long OTA updates.

 

[Jerrytball]

the SOH% is for the HV battery only, and only visible via ODB2 with an App like CarScanner.

The Fordpass webpage was displaying SOC% of the 12v battery for a while, but that was "fixed" to show SOC% for the HV battery.

SOC% for the 12v is largely irrelevant, and will swing considerably in normal use between 12.4 and 14v. It is important to drive around long enough, or leave your MME "on" overnight, every month or two at a minimum to give the 12v time to charge up to 95+% to desulfate, and have charge on board for long OTA updates.

This is actually the one I have, and like I said, before I actually paid to unlock the full version because at first it was giving me the percentage and other things, then seems like when I paid for it and there was an update that was gone, and I thought I’ve seen others say the same thing but if somebody can show me But this works with Car Scanner?
I have the iOS version of this one though

 

[Jerrytball]

the SOH% is for the HV battery only, and only visible via ODB2 with an App like CarScanner.

The Fordpass webpage was displaying SOC% of the 12v battery for a while, but that was "fixed" to show SOC% for the HV battery.

SOC% for the 12v is largely irrelevant, and will swing considerably in normal use between 12.4 and 14v. It is important to drive around long enough, or leave your MME "on" overnight, every month or two at a minimum to give the 12v time to charge up to 95+% to desulfate, and have charge on board for long OTA updates.

So The one area I was talking about earlier if you’re charging the car overnight and just leave it plugged in does it do anything to the low level 12 V battery? Well yesterday I put the charger on it and it never charged up, but Just now after leaving The level two charger plugged in since yesterday evening I go out there to 12 V batteries completely charged according to the tester I put on it. So I also put the battery maintainer on there and it already said the battery was charged so I’m thinking when you do plug-in the level two charger. It does charge the 12 V battery and if that was set on here, I missed it sorry.

 

[RickMachE]

The 12v battery charges WHILE the car is charging. When the car is done charging, the 12v battery stops charging.

 

[dtbaker61]

So The one area I was talking about earlier if you’re charging the car overnight and just leave it plugged in does it do anything to the low level 12 V battery? Well yesterday I put the charger on it and it never charged up, but Just now after leaving The level two charger plugged in since yesterday evening I go out there to 12 V batteries completely charged according to the tester I put on it. So I also put the battery maintainer on there and it already said the battery was charged so I’m thinking when you do plug-in the level two charger. It does charge the 12 V battery and if that was set on here, I missed it sorry.

the 12v battery only gets charged WHILE the HV battery is actively charging, or the vehicle is "on".

 

[Ken Josing]

In older ICE vehicles there are usually signs that a battery is getting weak (slow/long crank for example) also a dead battery doesn't prevent you from getting into the car (there was a physical key you can use to unlock the door, and a mechanical door handle to open the door).

On these newer cars with only electronic keys (phone, nfc card etc) and electronic door actuators, a weak/dead 12v means you can't even get into the car.

On an EV, it's hard to tell if a 12V is getting weak since there's no cranking to start the car. So I can see why people are proactively replacing the 12V battery.

Also, older cars do not have a ton of electronics that stay awake 24x7 even when the car is off. Newer cars have computers that are always awake, thus constantly draining the 12v.

My wife's BMW X3 is on it's original battery after 9 years and it's still going strong. My BMW X7's battery was too weak to do any OTA updates last year at under 4 years old. It still starts the engine just fine, but the computer thinks the battery is too weak for it to complete OTA updates. Of course the X3 is much older and doesn't have a cellular connection or any kind of PAAK thus little to no power drain when the engine is off while the X7 is connected to 4G all the time and has paak.

Also temperature of the operating environment will affect a battery life span. When we used to live in Texas, our 12V would need replacement every 2-3 years due to the hot temps. Now that we're in a more mild climate (50-60 year round, occasionally 70-80 in summer). the 12'v batteries are lasting much longer, frequently over 10 years.

I have a 21 Job 1 that was built in December 2020, 12v still going strong in it.

Great write up! I have 2021 Premium 2WD large battery built December 2020. I purchased the Mach-e 2/19/21 now has 36K miles. Original battery in play with no problems with the battery or the car. I'm not sure when to replace or what the replace now situation will be. My mustang is in the garage 24/7 along side my 2002 GMC Sierra Denali. I purchased the battery in the vehicle from COSTCO back in December 2014 and like your wife's car going strong. We live in Southern California, Moorpark. My wife's car, also with a battery from COSTCO took a dump before 3 years. I'll replace the MME battery at the first sign of weakness, just don't know when that will be. Looking around this forum, I see many MME with their original battery and 48 months old.

 

[Jerrytball]

I just ran across this and I was thinking of my past Mustang friends. And I definitely would get this if I still had my GT looks pretty handy.

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