HYBRID 12V Battery Mystery SOLVED

[MakinDoForNow]

Would love to see details on how that was installed - it comes with it's own shut. How do you keep it's (auxiliary) battery charged? Where in the truck did you mount the display?

I assume it is plugged into the dash PowerPoint and has a separate battery to power it's display and other needs. It could charge it's battery when the buss exceeds more than 13 or some voltage.

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[El Kabong]

I assume it is plugged into the dash PowerPoint and has a separate battery to power it's display and other needs. It could charge it's battery when the buss exceeds more than 13 or some voltage.

Since the description includes an external battery I'm going by the Amazon listing for it which has pic related. I'm just wondering where the shunt is installed for the Maverick setup.

 

[johnDeere]

My shunt is between where the ground connected to the body ground.
i could have charged the extra battery through a diode, but didn't want to mess up the BMS calculations for the SOC, that is all ready messed up system.

 

[Darryl]

Is that really a real thing. I've heard so many different methods in this forum other than fixing it.

I left the key on all night and let the air out of the tires. Then while walking to work in the morning, I kicked a can down the road to symbolize how the Blue OutofRound has dealt with this.

I know Ford dragged their feet . But it seems as if they've come up with a solution that seems to work for most vehicles that have a drain. It simply involves reprogramming the ACCM and the ABS module. It's worked for our customers. I recommend getting it done. Truth be told, I believe they have been working on it because they had to actually buy back a number of vehicles that developed unsolvable problems during each States lemon law window. And they've replaced numerous batteries under warranty as well. This problem has cost them a good chunk of money

 

[Red Eyes - Wide Shut]

I know Ford dragged their feet . But it seems as if they've come up with a solution that seems to work for most vehicles that have a drain. It simply involves reprogramming the ACCM and the ABS module. It's worked for our customers. I recommend getting it done. Truth be told, I believe they have been working on it because they had to actually buy back a number of vehicles that developed unsolvable problems during each States lemon law window. And they've replaced numerous batteries under warranty as well. This problem has cost them a good chunk of money

Thanks, that is the most positive response I've heard. I have to say that after 2 dead batteries that my third seems to be holding up so far without having to do anything but drive it. This is as it should be.
Even though wel meant, I guess sometimes all this continuous chatter and charts, graphs and work arounds only puts another thorn in it.

 

[johnDeere]

I know Ford dragged their feet . But it seems as if they've come up with a solution that seems to work for most vehicles that have a drain. It simply involves reprogramming the ACCM and the ABS module. It's worked for our customers. I recommend getting it done. Truth be told, I believe they have been working on it because they had to actually buy back a number of vehicles that developed unsolvable problems during each States lemon law window. And they've replaced numerous batteries under warranty as well. This problem has cost them a good chunk of money

it could be true ford has a solution to the battery drain, but I think there keeping the whole problem a secret.
They don’t want to let the cat out of the bag, and say they have a problem with a number of maverick hybrids that they are unsure how to fix the issue.
That will hamper sales.
They all ready have recalls where there is a recall and they don’t have a fix yet, never less the replacement parts.

 

[HeyBales]

And if they drug their feet that long for a battery drain issue (obviously difficult to troubleshoot anyway) - I can only plan on them doing nothing about their BMS strategy of discharging a battery when it reaches 92% SOC for AGM or 85% SOC for SLA.
Preferring voltages closer to 12.1 than fully charged 12.8.
ETA: resting voltage.

 

[johnDeere]

And if they drug their feet that long for a battery drain issue (obviously difficult to troubleshoot anyway) - I can only plan on them doing nothing about their BMS strategy of discharging a battery when it reaches 92% SOC for AGM or 85% SOC for SLA.
Preferring voltages closer to 12.1 than fully charged 12.8.

Hello Mike, I agree, but it think you ment 13.1 not the 12.1 you wrote.

 

[HeyBales]

Hello Mike, I agree, but it think you ment 13.1 not the 12.1 you wrote.

Nope.
Resting voltage.
ETA: fixed my post.

 

[SafetyGuy]

Good day, all

Edit to add - We have a 2025 Hybrid Maverick with AWD and 4k tow pkg, with a stock AGM battery. So you know where I am coming from in my experience with my truck.

Well, I have been closely monitoring my Mav 12 volt battery since the end of November...using both my simple voltage indicator (inserted into the 12 volt power port/cigar lighter in the truck cab) and metering the battery at the boost points under the engine bonnet to check on the batteries charge levels.

I have been regularly recharging my 12 volt battery at least monthly.

I have repeatedly charged the 12 volt battery and carried out the battery relearn (closed and locked up truck for at least 9 hours so it could have a good long think about its job in its life and maybe charge better when driving).

When @Mavster Mechanic came out with his solution to aid in getting the truck to charge at a higher level by either turning on the headlights, turning on the park lights or plugging in a light into the trailer electrical plug, I jumped on the bandwagon to see if it makes a positive difference or not.

I now have a light plugged into the trailer 4 pin electrical point and all my previous errant 12 volt charging issues have disappeared into the past!

We were just out and about again today, and my indicated voltage levels max out at 15 volts (max suggested voltage for 12 volt agm batteries). They used to almost always sit at 15.1-15.3 or more volts when we were driving. When we arrived at home today, it was charging at about 14.59 volts.

My metering of the 12 volt battery when we shut down (after 90 minutes-ish everything shuts down and the battery has had time to relax) is over 12.85 volts. Completely acceptable to me!

Anyways, just sharing my experience with trying to keep our 12 volt batteries at their optimal charge level, and so far this is a simple, no cost method...As a simple and usually-frugal guy, I like that a lot!

Thanks again to @Mavster Mechanic for his hard work in not only discovering this work around, but for taking the time to come here to the MTC and share it with us.

Have a great day,

Andy

 

[Cherokee]

So,
Nobody has solved anything.
I didn’t think so.

Ya’all you Youngers,
Us boomers are dying out,
The Gen X’ers are retiring.

You all are so screwed.
Just keep designing stuff that,
No body needs or wants,
That never works well or worked at all,
That no body can fix or modify to make it better.

In ten years you won’t be able to get shit fixed,

You all are so screwed.

And quit spending close to or north of a thousand on a Four banger trying to make it sound like a V-8.
You’ll get the same thing all the kids have been getting for decades.
A buzzy, whiny noisy 4 banger.

There is no replacement for displacement.

Hey my fellow old farts.

“Imagine a Mav with that sweet 302 V-8 Ford used to put in so many models.”

That should excite you boys to the core.
That’s what power sounds like.

 

[Finnster]

@ SafetyGuy,
Did you receive the Trailer Module 26C10 (OTA) update yet?
I received the update on my maverick 25Xl hybrid and my charging problem(same as yours), immediately fixed itself! With or without the plug in hitch brake light!
Please remove your hitch brake light and see what happens.

And one more thing, my MPG (indicated) @ 70mph immediately jumped by 23%. But some of that is related to N.E. Wisconsin's sudden increase in temperature today, 90F. vs 50F. last week before my update.

 

[Darryl]

Thanks, that is the most positive response I've heard. I have to say that after 2 dead batteries that my third seems to be holding up so far without having to do anything but drive it. This is as it should be.
Even though wel meant, I guess sometimes all this continuous chatter and charts, graphs and work arounds only puts another thorn in it.

I totally understand everyone's frustration. A new vehicle should start every time and operate as designed without incident. And as a Ford tech. It's frustrating to not be able to fix a car. But I can also say that I didn't feel bad because I used EVERY resource available. I can also say that Ford hasn't simply been sitting on its hands. They literally sent a field service engineer to OUR dealership after several detailed conversations. The frustrating part was that disconnecting circuit in order to perform the tests would often make the problem disappear mid test. I think the most frustrating thing in THIS particular conversation is that I'm sensing that even though Ford seems to have finally come up with a fix, some are dismissing it without trying it and would rather continue the various "workarounds". I say at least TRY the Ford fix given that they've been waiting for it for years. Another frustrating thing is that the problem isn't universal. The VAST MAJORITY of hybrids operate normally with zero battery issues. But the relative few that have problems are difficult to fix. And also, every Ford fix actually fixes SOME trucks but not all.

 

[Mavster Mechanic]

@ SafetyGuy,
Did you receive the Trailer Module 26C10 (OTA) update yet?
I received the update on my maverick 25Xl hybrid and my charging problem(same as yours), immediately fixed itself! With or without the plug in hitch brake light!
Please remove your hitch brake light and see what happens.

And one more thing, my MPG (indicated) @ 70mph immediately jumped by 23%. But some of that is related to N.E. Wisconsin's sudden increase in temperature today, 90F. vs 50F. last week before my update.

All of the MPG gain is related to temperature gain.
Hotter the better until you turn air conditioning on.

 

[Mavster Mechanic]

I totally understand everyone's frustration. A new vehicle should start every time and operate as designed without incident. And as a Ford tech. It's frustrating to not be able to fix a car. But I can also say that I didn't feel bad because I used EVERY resource available. I can also say that Ford hasn't simply been sitting on its hands. They literally sent a field service engineer to OUR dealership after several detailed conversations. The frustrating part was that disconnecting circuit in order to perform the tests would often make the problem disappear mid test. I think the most frustrating thing in THIS particular conversation is that I'm sensing that even though Ford seems to have finally come up with a fix, some are dismissing it without trying it and would rather continue the various "workarounds". I say at least TRY the Ford fix given that they've been waiting for it for years. Another frustrating thing is that the problem isn't universal. The VAST MAJORITY of hybrids operate normally with zero battery issues. But the relative few that have problems are difficult to fix. And also, every Ford fix actually fixes SOME trucks but not all.

Sure.

But it's super inconvenient and generally unpleasant to go to a dealership. Some of us work 40-50-60 hour weeks and very few dealerships are open weekend anymore.

The headlamps / parking lamps on is a great temporary fix.

I'll get to a dealer when I NEED to.
I don't need it right now.

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