2023 dead battery once again

[Pipsquek]

So the dealer is blaming the stereo guy, and the stereo guy is blaming the dealer. But here is the weirdest thing: sitting still, the battery seems to last forever. But when I go for a ride, like 20 or 30 miles, even with the stereo turned down low, the next day it goes into the low power mode, battery saver mode. Have any of you guys noticed a problem like this? By the way, I have a 2023 Ford Maverick hybrid lariat

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[HeyBales]

Sitting still?
You mean turned off, or literally sitting still at like a red light or in parking space?
I'm guessing you mean turned off - last forever is how long until your next drive?
How do you know the battery is doing well?


There is no low power mode, just battery saver mode.
How do you know that has happened, because the lights are off almost instantly on entry or exit, or don't turn on at all?

Could be on that 20-30 mile drive, on truck turn off something really didn't turn off.
Or at least for the initial 60-75 min before everything should go to sleep, something had a much higher draw than normal.
Meaning the next day battery is now low enough that battery saver is thrown on.

But unless you had a very long drive that next day - battery ain't going to recover from that drain the prior day.

Hopefully you are aware of the battery problems - your 5 similar threads below may be focused on the potential drain issue that hits some.

But there is also just the undercharged battery issue with all those threads.
Throw a high drain for 60-75 min on one of those batteries - it won't be happy the next day.

 

[tiktokbrainrot]

Sitting still?
You mean turned off, or literally sitting still at like a red light or in parking space?
I'm guessing you mean turned off - last forever is how long until your next drive?
How do you know the battery is doing well?


There is no low power mode, just battery saver mode.
How do you know that has happened, because the lights are off almost instantly on entry or exit, or don't turn on at all?

Could be on that 20-30 mile drive, on truck turn off something really didn't turn off.
Or at least for the initial 60-75 min before everything should go to sleep, something had a much higher draw than normal.
Meaning the next day battery is now low enough that battery saver is thrown on.

But unless you had a very long drive that next day - battery ain't going to recover from that drain the prior day.

Hopefully you are aware of the battery problems - your 5 similar threads below may be focused on the potential drain issue that hits some.

But there is also just the undercharged battery issue with all those threads.
Throw a high drain for 60-75 min on one of those batteries - it won't be happy the next day.

What are you doing to your poor 12v that a half hour drive cant charge it?

Hybrids dont use the 12v to start the engine. All its doing is running the cabin electrics.

So the dealer is blaming the stereo guy, and the stereo guy is blaming the dealer. But here is the weirdest thing: sitting still, the battery seems to last forever. But when I go for a ride, like 20 or 30 miles, even with the stereo turned down low, the next day it goes into the low power mode, battery saver mode. Have any of you guys noticed a problem like this? By the way, I have a 2023 Ford Maverick hybrid lariat

Like most older hybrid owners you likely have a cheap motorcraft flooded cell. Replace it with a proper high quality AGM or Lithium Iron Phosphate AGM replacement and be sure to reset the computer so it sees a new battery.

 

[Pipsquek]

I’m in the truck, sat at the dealership for several days without them driving it, and they checked it okay. It’s not at the stereo guy for several days and the voltage kept checking fine, but nobody ever drove it. I drove it for 25 to 30 miles on the highway with the stereo at a normal level because I was listening to news radio, parked it, went inside for a couple hours, came back outside, drove it back home on the highway for 25 to 30 miles, stop for two different errands on the way home, and everything was fine. It was just sitting in front of my house overnight, nothing was left on. and the battery is showing 2 volts

 

[HeyBales]

What are you doing to your poor 12v that a half hour drive cant charge it?

Hybrids dont use the 12v to start the engine. All its doing is running the cabin electrics.

Like most older hybrid owners you likely have a cheap motorcraft flooded cell. Replace it with a proper high quality AGM or Lithium Iron Phosphate AGM replacement and be sure to reset the computer so it sees a new battery.

Who said the 12VB starts the engine?
Since you quoted me...

And the hybrids drop to float level charge about 10-15 min into the drive, unless you had a serious drain, then it's inspired to charge higher for longer.
Otherwise 15-20 min of float charge at 1/2 Amp ain't doing much for a battery.

And the 12VB ONLY runs the 12V system when not in On or Ready state.
Well, or when the SOC reaches 92% AGM or 85% FLA, and nothing special going on for tricks.

 

[HeyBales]

I’m in the truck, sat at the dealership for several days without them driving it, and they checked it okay. It’s not at the stereo guy for several days and the voltage kept checking fine, but nobody ever drove it. I drove it for 25 to 30 miles on the highway with the stereo at a normal level because I was listening to news radio, parked it, went inside for a couple hours, came back outside, drove it back home on the highway for 25 to 30 miles, stop for two different errands on the way home, and everything was fine. It was just sitting in front of my house overnight, nothing was left on. and the battery is showing 2 volts

Ok - classic parasitic drain.

There are 2 that Ford thinks are the worst offenders, they put into an SSM for an upgrade to the ABS & AC modules.

You may have had 1 of those.
Or a different one.
Or a stereo one.

If still with a 3/36k warranty - you may be able to get the upgrades done if you can convince them it might be those.
But they will point to a 3rd party stereo.

Stereo guy should know how to track down a parasitic drain to them - but you gotta figure out how to make it NOT intermittent, rather on-demand by whatever sequence of turnoff allowed it.
I'd think if stereo you could make it happen again.
Think carefully about your exact shutoff sequence. Test it on charged up battery.

If one of the others - truly infrequent.

 

[Pipsquek]

It is actually on its second AGM battery

 

[Pipsquek]

Dealer says it has .38 amp draw sitting stereo guy says it lost 1/100 of a volt over the weekend problem seems to be when I drive it. Stereo guy tested battery while idling and charging was only 12.7 volts. Not sure about a hybrid but normal gas engine that would seem low

 

[tiktokbrainrot]

Who said the 12VB starts the engine?
Since you quoted me...

And the hybrids drop to float level charge about 10-15 min into the drive, unless you had a serious drain, then it's inspired to charge higher for longer.
Otherwise 15-20 min of float charge at 1/2 Amp ain't doing much for a battery.

And the 12VB ONLY runs the 12V system when not in On or Ready state.
Well, or when the SOC reaches 92% AGM or 85% FLA, and nothing special going on for tricks.

Well, you're talking about the 12v battery having to "recover" during a half hour drive, but unlike ICE only models, the 12v doesnt have a huge drain on it to start. The smart charging system on the mav wont limit it to just 1/2 an amp if there is an actual draw when driving.

On the "hybrid 12v battery charging mystery SOLVED" thread, which was deleted for unknown reasons, it was established that just having your headlights turned on will tell the system to keep the 12v fully charged, as will having the cabin fan on a speed 5 of higher.

so I'm confused, if the system will charge when there is any serious load, and the 12v isnt running the systems when the vehicle is on (it does run them, the system cant isolate the 12v cell, its still getting drawn from during operation) then what is drawing so much power the truck cant charge it?

Dealer says it has .38 amp draw sitting stereo guy says it lost 1/100 of a volt over the weekend problem seems to be when I drive it. Stereo guy tested battery while idling and charging was only 12.7 volts. Not sure about a hybrid but normal gas engine that would seem low

The smart charger wont slam 14.4v unless you have headlights on or the fan is cranked up or there are trailer lights attached.

I'd invest in a bluetooth 12v smart monitor, see when the battery is actually losing capacity. If you can show proof it is dropping when driving and take it to the dealer they will have something to work with.

 

[Glen Baker LLC]

Well, you're talking about the 12v battery having to "recover" during a half hour drive, but unlike ICE only models, the 12v doesnt have a huge drain on it to start. The smart charging system on the mav wont limit it to just 1/2 an amp if there is an actual draw when driving.

On the "hybrid 12v battery charging mystery SOLVED" thread, which was deleted for unknown reasons, it was established that just having your headlights turned on will tell the system to keep the 12v fully charged.

@tiktokbrainrot
Is this the thread you're referring to
https://www.mavericktruckclub.com/forum/threads/hybrid-12v-battery-mystery-solved.81553/

 

[Mavster Mechanic]

Dealer says it has .38 amp draw sitting stereo guy says it lost 1/100 of a volt over the weekend problem seems to be when I drive it. Stereo guy tested battery while idling and charging was only 12.7 volts. Not sure about a hybrid but normal gas engine that would seem low

12.7v if the key is off or to accessory is normal and on the good side actually.


12.7v when driving or when it says "ready" means the system "thinks" you have a 100% charged battery (or 99% or 95% down to 92%) so it's not going to charge something it "thinks" is already charged.

This 12v thing is dumb.

 

[HeyBales]

Dealer says it has .38 amp draw sitting stereo guy says it lost 1/100 of a volt over the weekend problem seems to be when I drive it. Stereo guy tested battery while idling and charging was only 12.7 volts. Not sure about a hybrid but normal gas engine that would seem low

That's a high draw if sitting after 75 min max.
Should be 0.025-0.05 A draw during that sleep period.

If they measured during the 75 min max GOING to sleep - 1/3 A is a normal draw - shop manual has no recommended value as modules are doing things before they go to sleep.
They also did their testing wrong - supposed to wait until sleepy time to measure.

So with battery dying, I'm guessing someone charge it up totally - and the stereo guys did his test.
If he saw 12.7 V while running, that's because the battery had over 91% SOC on it - and the Maverick let's the 12V battery power the 12V system, until it drops to 87% SOC. Discharge, not charging.
Then it'll jump to the more normal 14.x and under 1 A float charging.

So stereo guy saw normal behavior - dealer saw excess draw if that was during sleep time.
Tell the dealer there is an SSM on that - you'd like the module updates.

And hope for grins and giggles they don't troubleshoot it to your stereo - or likely to be charged diagnostic fee.

Oh yeah - read that link first page - shows you how to get past the 92% it'll start discharging at.

 

[710-oil-614]

Knowing the issues with the hybrids electrical and 12v I would never mess with it for stereo equipment. I don’t doubt that is the leading cause of your issues exacerbating the existing issues with Ford’s BMS.

Im afraid to even hardwire my dash camera and radar detector and those will use fuse taps to an ignition power source only.

 

[Techcar]

Seems to me the easy way to find out who is right is to disconnect the stereo for a few days after charging the battery and drive it around and see if the problem returns .

 

[ZABSMAV]

What are you doing to your poor 12v that a half hour drive cant charge it?

Hybrids dont use the 12v to start the engine. All its doing is running the cabin electrics.

Like most older hybrid owners you likely have a cheap motorcraft flooded cell. Replace it with a proper high quality AGM or Lithium Iron Phosphate AGM replacement and be sure to reset the computer so it sees a new battery.

Here's some points to consider when you suggested a LiFePO₄ (12V Lithium Iron Phosphate) battery as a replacement.

Those batteries are not directly compatible as a drop-in replacement for the flooded lead-acid battery in a Ford Maverick Hybrid. While, yes, there are a few specialized automotive lithium batteries with proprietary built-in microcontrollers (like Ohmmu) that do exist to "trick" a vehicle into accepting them, but putting just a standard off-the-shelfLiFePO₄ battery in the Maverick hybrid will trigger major electrical errors and a charging system failure.

The Maverick’s Battery Management System (BMS) controls charging profiles specifically tailored for lead-acid or AGM batteries. It will continually overcharge or undercharge a standard LiFePO₄ battery, significantly shortening the lithium cells' lifespan.

The Maverick Hybrid's low-voltage battery sits under the rear passenger seat. Standard lithium batteries cannot safely accept a charge if the temperature drops below freezing (32°F / 0°C). Attempting to do so will permanently damage the cells or triggers the battery's built-in safety shutoff, instantly crippling the Maverick with a "dead" 12v battery.

You cannot recalibrate or reprogram the truck's factory BMS to recognize a native lithium charging profile.

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