Need for battery maintainer for new 2025 XLT with AGM?

[HeyBales]

Guessing it's just a time-based function. I don't recall opening the doors recently but it is possible... probably been about 5 days or so since I last messed with the truck (added the quick connect to the power terminals under the hood).

FWIW the hood is left open and an extra key fob is about 10' away hanging on the wall in the garage though I don't know if either of those items would effect the way the truck goes into the sleep mode.

There's no indication or alert or message when it does this, so I assume it's just a time-based function.

As long as no cat is playing with the keys - the remote has it's own sleep mode on non-movement for the keyless entry.
Truck still stays awake listening for a fob, but the fob stops broadcasting.

The hood open should be a problem though.
To obtain the 60 min max (25MY I thought someone with Forscan found) before going to sleep, all the sensored openings must appear closed. Not sure how long the timeout is if something is left open. Like eventually a light on because door isn't closed will go ahead and turn off - but is the sensor & module supporting it staying active?
Instructions for finding a parasitic draw are close (by moving the latch) all doors/hood/tailgate that has a sensor on it, then wait the max time (75 & 60) for all modules to turn off - then measure and find the problem if Amp usage is high.

So maybe that's why the Battery Saver for lights is enabled, just as a way turn several things off that the open hood would otherwise have on.

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[ZABSMAV]

I drive about 100-150 miles a week and I have not yet seen the saver battery mode. I have been driving my 25 EB Lariat since the end of March.

I wish people wouldn't call this a "battery saver mode". Deep sleep indicates that the 12v battery is already near failure due to chronic undercharging that has led to sulfation.

 

[gzebrick]

I can snake the quick connect an out from under the hood so I’ll try it with the hood closed. Again I’m okay with it either way just odd that it is based on time and not voltage.

 

[Dave O]

I will not manage a battery tender on a $40K 2025 vehicle but I do have a WolfBox 4000A Jumper Box under the rear seat (yet to need it but it gives me peace of mind)…

 

[ZABSMAV]

I will not manage a battery tender on a $40K 2025 vehicle but I do have a WolfBox 4000A Jumper Box under the rear seat (yet to need it but it gives me peace of mind)…

I bought the same jump box, just in case. Our 2023 Maverick Lariat Hybrid with Lux was $6,000 less than your 2025 when we bought ours Lariat new in November 2023.

I'm with you. We didn't buy, and were never advertised and sold, a plug in hybrid vehicle. Ford has an obligation to permanently solve this deep sleep problem that indicates their poor engineering is repeatedly causing the early death of the 12v battery in everyone's hybrid Maverick.

By the way, at the same time, we also bought the WolfBox 12000mAh & 150PSI Heavy Duty Tire Inflator Portable Air Compressor inflator.

Link to inflator on Amazon:
https://a.co/d/9dhUTGH

 

[gzebrick]

Just to make clear, as far as I can tell the battery is fine. My $16 battery tender is what I put on other vehicles and 2 tractors that may only get started every few weeks. Not thrilled that the maverick kills the interior lights after some period as a precaution, but not a show stopper for me. It’s not a daily driver.

 

[Packer Bill]

Just to make clear, as far as I can tell the battery is fine

Do you know what the state of charge is for your battery?

 

[Chopperbobc]

Battery voltage is not the only thing that controls the cabin lights etc....many times my cabin lights would not come on when battery voltage was 12.6 volts....

 

[MakinDoForNow]

Well the truck turned off the interior lights again on me but everything comes right up when you hit the start button -Been about a week since we drove it.

Doesn't seem to be related to battery charge (I have had a maintainer on it showing 100%).

Once again, I don't think it is a bug, but a feature. Never had a vehicle do that before though.

When the maintainer is on yours do you have the negative connected to the battery terminal or to ground on truck side of the BMS which is attached to the negative terminal.

 

[Mavster Mechanic]

I bought the same jump box, just in case. Our 2023 Maverick Lariat Hybrid with Lux was $6,000 less than your 2025 when we bought ours Lariat new in November 2023.

I'm with you. We didn't buy, and were never advertised and sold, a plug in hybrid vehicle. Ford has an obligation to permanently solve this deep sleep problem that indicates their poor engineering is repeatedly causing the early death of the 12v battery in everyone's hybrid Maverick.

It's not ALL the hybrids.

It's more than a few.

1%? 2%?

They are just concentrated all on a few MTC threads so it feels like a lot.

I'm using the stock 12v battery for over 3 years now. Made it past the 3/36k (in both regards) so they met their duty.

And this "issue" is probably talked about across makes and models. It's not unique.

 

[ZABSMAV]

It's not ALL the hybrids.

It's more than a few.

1%? 2%?

They are just concentrated all on a few MTC threads so it feels like a lot.

I'm using the stock 12v battery for over 3 years now. Made it past the 3/36k (in both regards) so they met their duty.

And this "issue" is probably talked about across makes and models. It's not unique.

This is not the sole forum for Mavericks. There are a bunch of other ones, on the web, and on Facebook. It is obviously much more than your stated 2%. I would venture half of the owners have had the deep sleep problem, but unless they actually must use the FordPass app for key features, such as remote engine start, they may simply be oblivious that their Maverick even went into deep sleep.

 

[Master Blaster]

Its not 1% or 2%, its virtually all Hybrids. Because of the incorrect BMS software decision to only charge the battery to 70% max, it always sulphates. The only change on the 25s is the switch to an AGM battery, which is somewhat more resistant to sulfation, thus hiding the issue for longer. Its not a fix at all.

This BMS mis-programming issue is affecting probably 50% of the Ford and Lincoln lineup at this point - any Maverick, F150, Mach-e, Mustang, Escape, Corsair and probably others that have a BMS in their build.

The BMS sensor on the battery is $35 at retail prices. The BMS software is the reprogramming cost - call it $100. Every battery that they replace is costing $212, and I'm almost at the point of getting my 4th one under warranty. It would seem to be far more cost-efficient to just fix the problem instead of hiding it.

Ford has already missed 2 announced dates to release the fix, and instead only fixed an incidental parasitic leak from the a/c software. It would be really useful if Ford published a real date for the fix to be available and then stuck to it.

 

[ZABSMAV]

Its not 1% or 2%, its virtually all Hybrids. Because of the incorrect BMS software decision to only charge the battery to 70% max, it always sulphates. The only change on the 25s is the switch to an AGM battery, which is somewhat more resistant to sulfation, thus hiding the issue for longer. Its not a fix at all.

This BMS mis-programming issue is affecting probably 50% of the Ford and Lincoln lineup at this point - any Maverick, F150, Mach-e, Mustang, Escape, Corsair and probably others that have a BMS in their build.

The BMS sensor on the battery is $35 at retail prices. The BMS software is the reprogramming cost - call it $100. Every battery that they replace is costing $212, and I'm almost at the point of getting my 4th one under warranty. It would seem to be far more cost-efficient to just fix the problem instead of hiding it.

Ford has already missed 2 announced dates to release the fix, and instead only fixed an incidental parasitic leak from the a/c software. It would be really useful if Ford published a real date for the fix to be available and then stuck to it.

Thank you for saying what I have tried to say in the past on here. You do so very eloquently. I think it comes down to plain incompetence in engineering and a financial decision to focus on new sales instead of customer service to existing customers. Maybe this is just the chickens coming back to roost for Ford due to these engineering faux pas coming back to bite them now that people do their due diligence before buying something from that manufacturer and find out that Ford doesn't care about the owners after the sale. If they did, they would fix things like deep sleep.

 

[Mavster Mechanic]

I would venture half of the owners have had the deep sleep problem, but unless they actually must use the FordPass app for key features, such as remote engine start, they may simply be oblivious that their Maverick even went into deep sleep.

So you're saying it's no big deal to like 98% of owners and is a big deal to 2% of owners.

But I'll say it again.
2% isn't trivial.

That's about 5,000 units.

 

[bjwnet397]

Its not 1% or 2%, its virtually all Hybrids. Because of the incorrect BMS software decision to only charge the battery to 70% max, it always sulphates. The only change on the 25s is the switch to an AGM battery, which is somewhat more resistant to sulfation, thus hiding the issue for longer. Its not a fix at all.

This BMS mis-programming issue is affecting probably 50% of the Ford and Lincoln lineup at this point - any Maverick, F150, Mach-e, Mustang, Escape, Corsair and probably others that have a BMS in their build.

The BMS sensor on the battery is $35 at retail prices. The BMS software is the reprogramming cost - call it $100. Every battery that they replace is costing $212, and I'm almost at the point of getting my 4th one under warranty. It would seem to be far more cost-efficient to just fix the problem instead of hiding it.

Ford has already missed 2 announced dates to release the fix, and instead only fixed an incidental parasitic leak from the a/c software. It would be really useful if Ford published a real date for the fix to be available and then stuck to it.

A real optimist to think Ford would be responsive, or should we say delusional. Ford wants to keep their "customers" at arm's length. They refer you to the retail dealer for repairs and the retail dealer says "IDK" leaving us in the middle. In my opinion FORD is a joke as far as customer service is involved.

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