Battery Saver Mode - Constantly

[MakinDoForNow]

Doors would unlock but no lights inside at all until putting the key in and starting

It was not sleeping yet it was in battery save mode! No dome light is good indicator for a multistage maintainer with sulfate cycle to be put on jump posts with truck locked and undisturbed for a week or so. Does not have to be continuous but would be best if first three days were. Just keep it on as much as possible to give the sulfate procedure to run after the soc is brought to 100%. Every night 10-12 hours for 2 weeks should get battery set up for 2-4 months or more before dome light doesn't come on again. No one likes it and I don't either but I have oem batteries 27 and 34 months old and have never had a deep sleep and only no dome light twice as I just put maintainer on battery for three or more days about every third month.

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[TacoTanium]

Note that I said "onboard" with its own battery pack. So it should be charging battery when relay turns it on when the maverick 12v is below 12.2 volts. So as long as it's separate backup battery has power the maverick 12v should close the contacts and truck should start. Could feed a 12v buck booster which could use the separate 12v dc maintainer battery down to six volts to maintain the maverick 12v. Question is how large does the maintainer battery need to be? You might buy one hour or 10 days or ?, depending....
ETA: Come to think of it I have some 6 volt 400 AH AGM batteries that if I wanted to carry 250 lbs more around I could make a 400AH 12 Volt battery to power my maintainer! Along with a 60 lb solar panel to keep them charged. But I'm waiting for the 2025 battery charge fix.

That separate battery will be very busy keeping a bad battery charged, or trying to charge a battery that cannot hold a charge. In that case eventually your separate battery will go bad and may not have enough to keep it charge and your back and square 1 where the car doesn't start.

Now that you mentioned it, I've always wanted this separate battery but for only utility use. Can you share an electrical schematic showing how you connected your separate battery without affecting the BCM?

 

[HeyBales]

Resetting the BMS erases learned charge history/strategy, and makes it thoroughly sniff the battery behavior again. When used on a battery that's been in service for a while, it can help a bit. Similar to discharging a cell phone to zero and recharging to 100% on many phones recalibrates the "BMS".

I've done it once on the Mav, which seems to have improved the long term charge state by a few tenths, the BMS manages the battery.

"new" batteries are installed with a variety of charge states depending on their age, temp of transport and storage and of course the exact capacity, CCA, etc of the new battery (it may not be a factory equal replacement).

It also resets the PID field for age of battery in days.
(ETA: It does not change the value in Battery Age in Months in the BECM, it does reset it in the Vehicle Battery Days in Service in the BCM. But my Months figure 9, does not match the date on the battery 48th wk/23, nor the date mfg 3/24 - but at least that is close, so perhaps it's 9 months since that module was turned on even though truck wasn't finished, considering the battery can be user swapped and BMS reset doesn't change that date - I'm doubtful it's used for anything)

That could be used in SOC % calculations, some system do use it. Since it is a field, can only guess Ford is using it too.

The comparison to cell phone is good - full recharge as you said, but not reset at unknown level thereby saying this is the new fully charged level.

A relearn overnight, with a fully charged battery, no BMS reset, also causes the SOC% to be reset in the morning from 2 tests I've done. There's your sniff the battery behavior again.
Which is probably good as temp changes, as SOC% changes with that too.
The manual doesn't indicate that relearn process needs any setup to tell it to do it, merely locked doors and no accessories on.
Of course it did the same after BMS reset and then overnight also, but it's evident that was the overnight aspect, not the reset process.

 

[MakinDoForNow]

That separate battery will be very busy keeping a bad battery charged, or trying to charge a battery that cannot hold a charge. In that case eventually your separate battery will go bad and may not have enough to keep it charge and your back and square 1 where the car doesn't start.

Now that you mentioned it, I've always wanted this separate battery but for only utility use. Can you share an electrical schematic showing how you connected your separate battery without affecting the BCM?

I have not put it together yet but will use a 12v fuze. Some portable power stations (bluetti?) allow dual or triple 12v input just have to check input limits of model you choose. I'll have to check and see what's feasible.

 

[Meeka]

That's a great ideal putting that there.

Nice! Almost looks factory, ‘cept Ferd ain’t that smarts’

 

[okgaz]

I really don't know how much energy it takes to cold-start the 2.5 hybrid vs the 2.0 ecoboost, and the battery monitor strategy is very different between the 2 vehicles since the hybrid charges 12V only from the high voltage hybrid system (there's no alternator).

but really, I think the issue is simple, the factory hybrid battery is too small and it's not AGM. some people got real aggressive with this and modified the battery box to accept a considerably larger battery, but if a person searches (heh) they can find AGM batteries people say fit without modification.

it's been too little time to see how the AGM batteries that people have been installing will work long-term over 4-5+ years, but I have not seen a single post (maybe they do exist?) where someone with a hybrid installed *any* AGM battery, reset their BMS (search that, too ) and then still had any issues with deep sleep.

Desperately hope you're right.

Installed a Delco that fits perfectly. After install, I charged it all the way, reset the BMS, and now hoping I don't have to go back to trickle charging every night.

 

[MakinDoForNow]

Desperately hope you're right.

Installed a Delco that fits perfectly. After install, I charged it all the way, reset the BMS, and now hoping I don't have to go back to trickle charging every night.

On any battery even after the FFF (Fabulous Ford Fix) I will continue to use my noco g5 or g10 every 10-12 weeks for 4-5 days not necessarily continuous but only intermit time off. Keep that sulfation and stratification down!!!

 

[Camdak]

On any battery even after the FFF (Fabulous Ford Fix) I will continue to use my noco g5 or g10 every 10-12 weeks for 4-5 days not necessarily continuous but only intermit time off. Keep that sulfation and stratification down!!!

That’s odd, cause the battery charger/maintainer that I have says to not use the sulfation mode on an AGM battery, maybe you can on the hybrid battery?

 

[MakinDoForNow]

That’s odd, cause the battery charger/maintainer that I have says to not use the sulfation mode on an AGM battery, maybe you can on the hybrid battery?

The noco's I have have an AGM MODE selection. It still spends hours in "OPTIMIZATION". After fully charging it automatically starts whatever it's procedure is for optimization! (It is different for agm batteries) My hybrid has a standard "enhanced" battery. My tremor which I sold had an AGM and I used it on that battery. The noco's have a repair mode which is for heavy duty sulfation and high voltages requiring battery be removed from vehicle. The noco's also have a "FORCE" mode which bypasses the safety detection and charges for five minutes before running the "does battery have minimum positive and is hooked up properly" test. Three years ago I let my Polaris ranger sit for several months without it's agm seeing it's noco. Was dead flat 0 volts. I put my noco g5 on with force mode on but since the battery was so small I took it off force after only 2 minutes. And started the AGM mode. Did restart the charge once or twice but after six weeks the optimization routine would finish after a few minutes. I'm still using that agm but it gets 3-4 days on g5 twice a year! Your maintainer just doesn't have an agm sulfate mode program.

 

[Camdak]

The noco's I have have an AGM MODE selection. It still spends hours in "OPTIMIZATION". After fully charging it automatically starts whatever it's procedure is for optimization! (It is different for agm batteries) My hybrid has a standard "enhanced" battery. My tremor which I sold had an AGM and I used it on that battery. The noco's have a repair mode which is for heavy duty sulfation and high voltages requiring battery be removed from vehicle. The noco's also have a "FORCE" mode which bypasses the safety detection and charges for five minutes before running the "does battery have minimum positive and is hooked up properly" test. Three years ago I let my Polaris ranger sit for several months without it's agm seeing it's noco. Was dead flat 0 volts. I put my noco g5 on with force mode on but since the battery was so small I took it off force after only 2 minutes. And started the AGM mode. Did restart the charge once or twice but after six weeks the optimization routine would finish after a few minutes. I'm still using that agm but it gets 3-4 days on g5 twice a year! Your maintainer just doesn't have an agm sulfate mode program.

No you’re right, mine just says normal and AGM, 1 amp or 4 amps. Still says use sulphation on normal batteries, but not AGM. Oh well.

 

[Ozarkbeard]

I have the NOCO genius 2 and use it every few weeks or whenever I won't be driving for a few days. I connect it using a quick connect plug connected to the charging points under the hood. When done, I disconnect the maintainer, reset the BMS and lock the truck for at least 8 hrs before driving it again. I also ran the maintainer the first night I got the truck bc it took over a month from Built-to-Delivery, w/o being driven.

'23 XL Hybrid and still on the OEM Flooded Lead Acid (non AGM) battery it came with. Never had a battery issue or warning. Additionally, I do not use the app and disconnected the Telematics modem (fuse #11 - passenger footwell location).

Hopefully, Ford's 1Q 2025 fix will finally solve the Maverick's battery issues that so many on MTC are having.

 

[D.W.]

Shouldn't have to but has anyone tried, ↓ Or similar
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