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MakinDoForNow

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I may be mistaken. I'll check again to make sure. But I do know it's a 470 CCA. I do know that the Ecoboost batteries are replaced with an AGM when we perform the recall. Maybe I was conflating the two.
I received the 470 CCA when mine was warranty replaced near Jan, 2025. It had the same size #BXT99Rt4-A as the CCA390 OEM. The difference was that 470CCA Is the MAX SERIES (3yr?) and has 10 more AH, if I remember correctly. It nowhere states AGM and is "enhanced" (something to do with better anode grid to allow deeper discharge and I'm guessing a higher concentration of acid). They do have an agm now which is even larger CCA and slightly taller than the 99R.
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rknrbt

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For the Battery recall 25S02 specifically has us to replace the original EFB (ENHANCED FLOODED BATTERY) battery with an AGM BATTERY in the bronco sport and Ecoboost Mavericks. The instructions are to inspect the vehicle. If it has the original EFB battery or a NON FORD battery, then we are to replace it with a new AGM BATTERY. I've performed several. So I actually remember the technical instructions
Thanks for this information. For some reason my dealership seemingly does not get the same messages or ignores them.
 

Darryl

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Thanks for this information. For some reason my dealership seemingly does not get the same messages or ignores them.
If the vehicle was not subject to the recall, it may or may not use an AMG replacement under general warranty. It depends on the parts catalog. But if it's replaced under the above mentioned recall, it's REQUIRED that they use the battery that's specified .. otherwise, the recall was not done properly. Ford is strict about recall instructions, especially safety recalls ( those with an S in the recall number) because of liability.
 

rknrbt

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If the vehicle was not subject to the recall, it may or may not use an AMG replacement under general warranty. It depends on the parts catalog. But if it's replaced under the above mentioned recall, it's REQUIRED that they use the battery that's specified .. otherwise, the recall was not done properly. Ford is strict about recall instructions, especially safety recalls ( those with an S in the recall number) because of liability.
OK, let me get this clear before I raise a stink with my dealership. This recall If for both EB and hybrids with bad batteries under warranty regardless of build dates? I have a '24 hybrid built in Jan'24. Battery was replaced once. Still have the same issue. I got the low battery mode warning 7 days after a full charge, 5 days after last being driven. SSM 53801 was supposedly done. Dealer has had my truck now for a week and they can find no noticeable battery drain. Not sure how hard they are looking though.
 

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OK, let me get this clear before I raise a stink with my dealership. This recall If for both EB and hybrids with bad batteries under warranty regardless of build dates? I have a '24 hybrid built in Jan'24.
Only '22-23 EcoBoosts were recalled for batteries.
 

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rknrbt

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Only '22-23 EcoBoosts were recalled for batteries.
That is what I was thinking, too. Something about a weld if I remember correctly. Ford NEEDS to recall or at least deal with anyone having a battery issue in the hybrids by replacing the flooded batteries with an AGM. Plus a software update to more properly allow the alternator to recharge the battery. I am about over the hybrids due to the battery issue on both my '22 and '24's.
 

OleFordGuy

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OK, let me get this clear before I raise a stink with my dealership. This recall If for both EB and hybrids with bad batteries under warranty regardless of build dates? I have a '24 hybrid built in Jan'24. Battery was replaced once. Still have the same issue. I got the low battery mode warning 7 days after a full charge, 5 days after last being driven. SSM 53801 was supposedly done. Dealer has had my truck now for a week and they can find no noticeable battery drain. Not sure how hard they are looking though.
To my knowledge recall 25S02 is only for EB Mavericks and Broncos to have factory EFB batteries replaced with AGM, does not apply to Hybrids. To my knowledge the only means of the factory batteries in the Hybrid to be replaced is if it tested bad in fords test procedures
 

rknrbt

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To my knowledge recall 25S02 is only for EB Mavericks and Broncos to have factory EFB batteries replaced with AGM, does not apply to Hybrids. To my knowledge the only means of the factory batteries in the Hybrid to be replaced is if it tested bad in fords test procedures
What I was afraid of but thanks for the info.
 

OleFordGuy

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That is what I was thinking, too. Something about a weld if I remember correctly. Ford NEEDS to recall or at least deal with anyone having a battery issue in the hybrids by replacing the flooded batteries with an AGM. Plus a software update to more properly allow the alternator to recharge the battery. I am about over the hybrids due to the battery issue on both my '22 and '24's.
Totally understand your position, imo replacing with an AGM is a short time fix but the only long term fix is for fords software engineers to correct the charging parameters but it hasn’t been done since they came out in MY22 with the issue so doesn’t look good for a real fix to happen imo
 

TheSEARCH

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Totally understand your position, imo replacing with an AGM is a short time fix but the only long term fix is for fords software engineers to correct the charging parameters but it hasn’t been done since they came out in MY22 with the issue so doesn’t look good for a real fix to happen imo
It doesn't seem they are willing or capable of doing a real fix and have the hybrid charge the darn 12 volt more. You wouldn't think that is hard,

But since it charges the 12 volt with the high voltage battery at least I think that is how it works maybe its more complicated than I realize?

This fix they have now MIGHT be ANOTHER issue some Hybrids have too. A double whammy of issues all related to 12 volt?

I just had bulletin done and battery replaced with another lead one. Will see how it goes. BUT I don't expect it to work.
 
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OleFordGuy

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It doesn't seem they are willing or capable of doing a real fix and have the hybrid charge the darn 12 volt more. You wouldn't think that is hard,

But since it charges the 12 volt with the high voltage battery at least I think that is how it works maybe its more complicated than I realize?

This fix they have now MIGHT be ANOTHER issue some Hybrids have too. A double whammy of issues all related to 12 volt?

I just had bulletin done and battery replaced with another lead one. Will see how it goes. BUT I don't expect it to work.
yep it's unfortunate. imo the hybrid is a great powertrain, probably the best of both worlds especially now that they have the awd and 4k tow ability but imo ford has tinkered too much with it since they stopped their toyota partnership on the hybrid powertrain. the strange thing to me is some report not having the issues but some as we see so often here with the issues do. weird.
If you look at the f150 forums, you see the same type issues reported on the hybrid version of the f150, ford's bread and butter vehicle model!!! you would think they would get their head out of the sand and cure the issue, but nope hasn't change with the f150 either so I don't envision a fix for the maverick either. call me weird or stupid, that's fine, but I won't be purchasing a ford hybrid vehicle until the issue, whatever it is, is resolved. to each their own, no problem with that, but that's my 2 cents on the issue.
 

HeyBales

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It doesn't seem they are willing or capable of doing a real fix and have the hybrid charge the darn 12 volt more. You wouldn't think that is hard,

But since it charges the 12 volt with the high voltage battery at least I think that is how it works maybe its more complicated than I realize?

This fix they have now MIGHT be ANOTHER issue some Hybrids have too. A double whammy of issues all related to 12 volt?

I just had bulletin done and battery replaced with another lead one. Will see how it goes. BUT I don't expect it to work.
Correct - not that complicated though to change things. DCDC Converter controls how many Amps go to the 12V system (or maybe the BECM does the split for the Amps just to the battery further downstream) specifically compared to rest of the 12V system. Seems they all get the same Voltage though, so no ability there to split things up.

As many have pointed out, less you drain the HVB, less you have to run the ICE to recharge it.
Less you have to run the ICE, better the MPG figures.

I'm sure some reason for undercharging is related to that desire - but can't imagine it being that big of a deal in MPG.
Also seems like they could up the amps only when ICE is running - hey, running already for several possible reasons - use it!

Also, battery sitting in cabin with people breathing - so pretty bad news to overcharge possibly and vent beyond what the vent tube can handle.

So they are probably hitting some failsafe line there for charging - but based on what?
Other vehicles have batteries in cabin areas basically (or are they more sealed away and vented better?)

If it's a matter of more expensive sensors, or more of them, to know what that failsafe line is - well I think we know why we got what we got.

I plan on starting another thread on this with data - but I'll say I was about to be impressed with how the BMS was handling my dying battery (now that I know it was), and the new battery.
Was.
Now I've seen it going the same direction.
 

HeyBales

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Dealer has had my truck now for a week and they can find no noticeable battery drain. Not sure how hard they are looking though.
The proving if there is a noticeable battery drain isn't that hard actually.
They should be able to give you those figures after several on/off sleep cycles while they've had it.
The truck logs what the drain was after it goes to sleep. Next time they turn it on with scanner attached - they get the figure.
But like any vehicle issues - they gotta catch it - that's the hard part many times.

But the computer will report what it saw as max drain in milliAmps during the prior sleep period.
My Bat_QST_Cur reading below - Battery Quiescent Current at 69 mA is higher than supposed max 50 mA, but that's not going to cause a massive draw difference, unless it's always at that level when it should be dropping back to 25 mA for big chunks of time.
That's not even an LED light on though - so searching that down could be considered a waste of time when the impact would be minimal.
But that reading would point out when something is clearly very wrong, that requires more indepth troubleshooting.

Ford Maverick SSM 53801: 2022-2025 Maverick Hybrid 12V Battery Drain Issue Update Fix Released! Screenshot_20250801-085309


(anyone else looking this over - 6 is my new battery age in days, temps show just started, and Eng_TQ shows ICE running, 12V Battery SOC is 80%, so only 5% away from fully charged.
So here already, start of a drive in the morning with good temp, only 5 Amps being sent to battery for recovery when they don't know how long I'll be driving. Perhaps that is the correct amps when only 5% away from fully charged. That is a topping charge already. Shockingly my cumulative charge is higher than discharge - but that was equal the next morning.)
 

rknrbt

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The proving if there is a noticeable battery drain isn't that hard actually.
They should be able to give you those figures after several on/off sleep cycles while they've had it.
The truck logs what the drain was after it goes to sleep. Next time they turn it on with scanner attached - they get the figure.
But like any vehicle issues - they gotta catch it - that's the hard part many times.

But the computer will report what it saw as max drain in milliAmps during the prior sleep period.
My Bat_QST_Cur reading below - Battery Quiescent Current at 69 mA is higher than supposed max 50 mA, but that's not going to cause a massive draw difference, unless it's always at that level when it should be dropping back to 25 mA for big chunks of time.
That's not even an LED light on though - so searching that down could be considered a waste of time when the impact would be minimal.
But that reading would point out when something is clearly very wrong, that requires more indepth troubleshooting.

Screenshot_20250801-085309.png


(anyone else looking this over - 6 is my new battery age in days, temps show just started, and Eng_TQ shows ICE running, 12V Battery SOC is 80%, so only 5% away from fully charged.
So here already, start of a drive in the morning with good temp, only 5 Amps being sent to battery for recovery when they don't know how long I'll be driving. Perhaps that is the correct amps when only 5% away from fully charged. That is a topping charge already. Shockingly my cumulative charge is higher than discharge - but that was equal the next morning.)
They might be doing that but I have my doubts. As I said I have not heard a word from them so have no idea what, if anything, is being done. I think the dealership has it in their mind my lack of daily driving is the cause and don't want to spend much time pursuing it if ford is not paying them for their time involved. Ford seems to be OK with just doing a lemon law claim and buying it back but damn I really like the truck other than this and this should something pretty easy to fix. At least I have 2025 Escape to drive while this is being worked out.
 

Darryl

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OK, let me get this clear before I raise a stink with my dealership. This recall If for both EB and hybrids with bad batteries under warranty regardless of build dates? I have a '24 hybrid built in Jan'24. Battery was replaced once. Still have the same issue. I got the low battery mode warning 7 days after a full charge, 5 days after last being driven. SSM 53801 was supposedly done. Dealer has had my truck now for a week and they can find no noticeable battery drain. Not sure how hard they are looking though.
Unfortunately the recall was only for the EcoBoost. Ford had another SSM That was supposed to address the low battery warning also. I will try to find it and post it later. I think in those cases the battery didn't actually die. But it would give a false warning. So you may have both issues. Finally, my field service engineer recommended that I disconnect the battery and check the voltage over several days to see if the battery had an internal condition causing it to lose voltage even if the car was not drawing any current. He said that there were some cases where the batteries themselves were also defective. But it would not show up on a normal battery load test. I will try to find that other SSM and posted hopefully later today
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