Hybrid: which battery powers which systems? Is there a list?

[HeyBales]

ok, so when the Ford app say "Battery Save Mode" (BSM) it is due to the voltage at the 12V, or a combination of the voltages from both HVB and 12V?

My truck went into BSM yesterday when I was doing a bunch of stuff inside the cabin, and doors were open and closed started it about 6 times without driving, etc. Probably used a few amps all together. So I charged the 12V using a smart 3 stage charger for a few hours. As soon as I disconnect the charger, the battery showed 13.4v, and this morning after sitting all night, was at 12.4v (I did not lock the doors) 12.4v isn't dead, but probably about 60% charged?

At one point today, I had full access with the Ford app, then it dropped back to BSM.

I've poured over a bunch of DSM and saver mode thread here, and have figured out that its a very complicated subject why these trucks go to saver mode.

I know this is the original factory battery in the truck because I bought it from original owner, and he says it's the one that came new. I've already ordered a new AGM H4 for the truck. Maybe that will be the answer?

Thanks to all of you for your input and comments.

Not really too complicated.

BSM:
Kicks in if startup voltage is seen at 12.1 or less (system isn't fooled by higher voltage after a drive, because it knows that's not a valid reading).
May not even be noticed as lights turn off sooner and sooner as voltage drops - until so soon it effects you.
Also kicks in for 25/26 if truck not started for 5 days.

DSM:
Kicks in if voltage drops to 9.5V, truck not started for 14 days (336 hrs), or SOC% drops below 40%.
May not be noticed if you don't use Ford app, since it merely disables the modem to stop hourly pings to keep the network up, which allows remote functions.

None of that on it's own indicates a bad battery by itself.
It's all done to conserve the battery for the next start - system has no idea how long that may be.
But it may give a clue what's going on.

Lights going off sooner - typical issue of undercharged - advice given above if a newer battery.
Receive Ford app alert of BSM and another for DSM some night when you had not been getting them.
Probably having an intermittent parasitic drain event, or battery already low and you left cabin light on that wasn't auto-turned off quick enough.

So yours held at 12.4V after a decent drain event - did the same thing to me after some maintenance with doors open/closed constantly.
The BMS system will be very motivated to provide higher charging amps until it feels recovered. It tracks Ah charging/discharging by the system, and will attempt to get them closer to equal.
Keep locking up at night - if you haven't yet the BMS Relearn didn't happen yet, to see the higher charge, and adjust it's internal SOC% figure.

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[doug maverick]

Drove 100 miles early this morning. I saw 14.7v from the cig lighter all morning. Headlights on obviously.

After truck sat for a few hours, my cig lighter is showing 12.4v when I switch key to acc.

But the dome light don't come on when I open the door. Do the dome lights know it's daylight outside? The worked as normal during the dark morning hours, but that was with the car in READY mode. Two day ago, when I opened the door, the dome lights came on automatically.

 

[doug maverick]

-Carry out a battery relearn where the truck learns that your battery is full and to start charging it to the new level...may take a few trys to get it to stick, and a variance from the manual ia to let the truck sit for 10 hours locked and closed up with no charger attached,

Is the keeping the doors locked fro 10 hours what you mean by "battery relearn"? Or is there something else that makes the battery 'relearn' ?

 

[SafetyGuy]

Is the keeping the doors locked fro 10 hours what you mean by "battery relearn"? Or is there something else that makes the battery 'relearn' ?

Yes, the battery relearn is when you have charged your battery fully, disconnected it, and you close up and lock the truck for 10 hours.

The manual says 8 hours (page 359 of my E-Manual), but it is thought that 8 hours doesn't allow for the time needed to shut down all the background power draws. Ergo the extra time.

Andy

 

[SafetyGuy]

Drove 100 miles early this morning. I saw 14.7v from the cig lighter all morning. Headlights on obviously.

After truck sat for a few hours, my cig lighter is showing 12.4v when I switch key to acc.

But the dome light don't come on when I open the door. Do the dome lights know it's daylight outside? The worked as normal during the dark morning hours, but that was with the car in READY mode. Two day ago, when I opened the door, the dome lights came on automatically.

It sounds like your truck is charging your battery like mine was, before I did a thorough recharge of the battery (with a smart 7 amp charger, set to AGM type battery) followed by a battery relearn.

Others here more knowledgeable and with more test equipment have stated it might not work the first time, so a couple of recharges and relearn cycles may be needed. It certainly won't hurt your battery if it is recharged properly a number of times.

My truck now has a 12 volt indicated level of between 13.1 - 13.53 indicated when I am driving now. (Using the 12 volt port indicator to display it).

As for your dome light, it does have a setting on the overhead console to on, on when door is opened etc, or off. First check to see what setting you have it on as they can be bumped and changed.

Now for the 12.4 reading you stated, I don't know what you did...was the reading where you momentarily turned power on and then off quickly....or was the 12.4 volt reading when you turned on power and then read it?

I would think that if your power indication is dropping quickly and lights are not coming on when settings are correctly set, that your battery may be struggling.

We don't know how old your battery is, what rype is it (SLA or AGM) or its condition...it may be that it has been weakened and letting you know that a new H4 battery is needed!

If anyone does change their battery, let's hope they read the manual and its warnings as well as done the procedures. Like fully charging it first and then the other steps needed so the truck knows a new battery is installed.

No, the dome lights do not know it is day out, thst may be a setting on the overhead console or your truck is trying to save your battery from discharging further.

I hope this helps,

Andy

 

[HeyBales]

Drove 100 miles early this morning. I saw 14.7v from the cig lighter all morning. Headlights on obviously.

After truck sat for a few hours, my cig lighter is showing 12.4v when I switch key to acc.

But the dome light don't come on when I open the door. Do the dome lights know it's daylight outside? The worked as normal during the dark morning hours, but that was with the car in READY mode. Two day ago, when I opened the door, the dome lights came on automatically.

The decision to be in battery save mode is the resting voltage from long enough off it's a valid reading - couple hours may not be long enough, I know it's not actually, as I've had inflated reading after couple hours, and still max BSM with lights off immediately.

Your battery is at a state the headlight on trick won't change anything.
You saw normal voltage that would be happening anyway, and likely the Amps down to normal float charge after 5-10 minutes. Which is good for a long drive, we know how long a battery charger can take.

You know the extra load trick is working when the running voltage drops back to 12.8 after some time driving.

Your battery is probably on verge of the 12.1 limit line for resting voltage.
It probably got up to 12.6 for the long drive - dropped back to 12.4. But the system is holding the 12.1 it saw this morning to decide on BSM.

 

[Mavster Mechanic]

Yes, the battery relearn is when you have charged your battery fully, disconnected it, and you close up and lock the truck for 10 hours.

The manual says 8 hours (page 359 of my E-Manual), but it is thought that 8 hours doesn't allow for the time needed to shut down all the background power draws. Ergo the extra time.

Andy

In my 2022, the battery "reset / relearn" is instant if I detach the battery and reattach it just minutes later.

 

[SafetyGuy]

In my 2022, the battery "reset / relearn" is instant if I detach the battery and reattach it just minutes later.

Thanks, another bit of information for me to store away for the future!

Andy

 

[doug maverick]

New AGM scheduled for delivery tomorrow. Stay tuned.

 

[Glen Baker LLC]

In my 2022, the battery "reset / relearn" is instant if I detach the battery and reattach it just minutes later.

David @Mavster Mechanic
Do you have to reset the radio, wifi or bluetooth phone connection settings after you reattach the battery cable? Or are they held in memory?

 

[doug maverick]

Do you have to reset the radio settings after you reattach the battery cable?

Probably. I don't know for sure, but someone MTC will certainly know. Least of my worries. For now I just want my dome lights to come on when I open the door in the dark.

 

[Glen Baker LLC]

Probably. I don't know for sure, but someone MTC will certainly know. Least of my worries. For now I just want my dome lights to come on when I open the door in the dark.

Maybe David @Mavster Mechanic
Would know.

 

[HeyBales]

Thanks, another bit of information for me to store away for the future!

Andy

Doesn't do that on the 24MY though.
Battery related figures are still stored in BMS regarding battery age and cumulative charge/discharge, likely other unviewable ones too. Despite a disconnect for several minutes. Nor was radio settings gone, so it wasn't that long of disconnect.
Strangely the MyView setting was back to digital speed, but that was it.

 

[Mavster Mechanic]

David @Mavster Mechanic
Do you have to reset the radio, wifi or bluetooth phone connection settings after you reattach the battery cable? Or are they held in memory?

No. Oddly enough. I wonder if the entertainment center has it's own small battery or just uses non-volatile memory.

I've had no 12v battery in the truck for 12 hours a couple of times.

On the flip side the dashboard settings / preferences revert to factory settings.

 

[Glen Baker LLC]

No. Oddly enough. I wonder if the entertainment center has it's own small battery or just uses non-volatile memory.

I've had no 12v battery in the truck for 12 hours a couple of times.

On the flip side the dashboard settings / preferences revert to factory settings.

Thank you.

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