Answers to "When does my LVB get charged" (with graph)

[chl]

Mine sits a lot as well. Less than 15K in 3 years. Routinely sits for a week or more. I’ve never gotten a warning.
Interesting side note - after a few days (never bothered to count the exact number), I notice that the interior lights fail to come on when I open the door. Some of the modules must be shutting completely down to conserve battery. I don’t think it’s a full deep sleep, though.

Yes it will shed loads as it get weak saving the best for last - the ability to start the truck.

I got the screen warning once or twice before I began trickle charging, when I had had the truck only 5 or 6 months. Would not install an OTA, and I became aware of the 12v battery issues when not driving it or charging it a lot, or just going for short trips.

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[RLXXI]

Adding to when the battery is being charged, in the graph it's showing a steady 14v between about 5am until almost 2pm.

I have a dual channel dash cam/dvr I run via cabin 110v to act as a sentinel while parked at work since Ford can't/won't let us use the 5 cams already on the truck. The truck is off with ppob on (2025) and is showing at least the potential of charging as it's only reading volts, no idea on how much if any current is flowing.

 

[chl]

Adding to when the battery is being charged, in the graph it's showing a steady 14v between about 5am until almost 2pm.

I have a dual channel dash cam/dvr I run via cabin 110v to act as a sentinel while parked at work since Ford can't/won't let us use the 5 cams already on the truck. The truck is off with ppob on (2025) and is showing at least the potential of charging as it's only reading volts, no idea on how much if any current is flowing.

Yes, if PPOB is on, then the HVB is connected and powering the inverters for the PPOB, and it would seem the DC-DC converter is also connected keeping the 12v battery system steady and charging the battery.

What happened at 2pm?
Did you turn the truck on resulting in a load on the battery?
Something put more of a load on the 12v battery system.

During charging, typically the voltage is held steady like in your graph, and the current gradually falls as the battery gets fuller.

The battery voltage will drop under load, but that's only a 'problem' with our AGM batteries if it goes down below 11.6V which could be a sign of a bad or undercharged battery or an excessive load.

 

[mr.Magoo]

Adding to when the battery is being charged, in the graph it's showing a steady 14v between about 5am until almost 2pm.


I have a dual channel dash cam/dvr I run via cabin 110v

I suppose I'm a bit confused, it's running off of 110/120V but we're looking at 14V when the truck is, off ?
What's the point of connecting it to both ?

 

[RLXXI]

I suppose I'm a bit confused, it's running off of 110/120V but we're looking at 14V when the truck is, off ?
What's the point of connecting it to both ?

It's a 12v battery monitor. The dash cams are using 110v, don't want them draining the LVB.

 

[RLXXI]

What happened at 2pm?
Did you turn the truck on resulting in a load on the battery?
Something put more of a load on the 12v battery system.

I started the truck and left.

 

[chl]

I suppose I'm a bit confused, it's running off of 110/120V but we're looking at 14V when the truck is, off ?
What's the point of connecting it to both ?

He has the dashcam running on the Pro Power On Board 110/120V.
The Pro Power On Board is run fromthe high voltage battery and an inverter to change it from DC to AC.

The 14V is the AGM 12v battery being charged

 

[chl]

I started the truck and left.

Ok thanks, that was my guess.

 

[queuewho]

I'll have to see if I can get similar data on a graph (albeit updated far less often) in home assistant.

 

[TechnoSwiss]

On your graph from about 8:15pm to 6:45am the next day, was the truck actively charging (energy being put into the battery) or just sitting with the charger plugged in.
I suspect it finished charging at the 6:45 time frame, which matches all my previous data.

One reason I set my charge station to charge slower (40A instead of 80A) is that it helps to charge the LV battery better due to the more time charging.

Yes, it finished charging the HVB around 6:45am and and then was just sitting plugged in.

 

[queuewho]

Yes, it finished charging the HVB around 6:45am and and then was just sitting plugged in.

something I always wondered about the extended range trucks with the dual onboard chargers... when charging at 40 amps and below, does it only ever use one of them, or does it switch back and forth to spread out the wear? I had my onboard charger go out in my model 3, wondering if one died in an ER lightning, if it can use one of the 2 after that...

 

[davehu]

I am pretty much non-technical. I started getting messages about my battery and when I tried to check it my self, it tested OK. However when I brought it to the dealer it was pretty much shot. It was replaced under warranty and no further message. I have a 2023 lariat with 30,000 miles.

had the same problem at 20k miles. dealer replace under warranty. problem stopped

 

[htobin]

Surprisingly I got the message again yesterday, having replaced the battery. Didn’t recommend any action other than to turn the vehicle off and on

 

[RickLightning]

something I always wondered about the extended range trucks with the dual onboard chargers... when charging at 40 amps and below, does it only ever use one of them, or does it switch back and forth to spread out the wear? I had my onboard charger go out in my model 3, wondering if one died in an ER lightning, if it can use one of the 2 after that...

It only uses the one.

 

[chl]

I keep my 12v battery on a trickle charger to avoid premature death (its, not mine).

Deep discharge, which the lightning algorithm allows, is not good for longevity of these batteries, and the high charging currents seen when the battery is low, are another bad feature of the lightning system of 12v battery management.

This post form the Mach-e forum goes into depth about these 12v AGM batteries:

https://www.macheforum.com/site/threads/how-to-recondition-service-your-12v-battery.11069/

And this one about the different ways to charge up the battery to get OTAs:

https://www.macheforum.com/site/threads/how-to-get-failed-otas-to-install.29749/

Also several threads here about putting trickle chargers on the battery and how to make it easier by adding a trickle charger wire:

https://www.f150lightningforum.com/forum/threads/charging-12v-battery.16979/

If the details about how AGM battery charging progresses are accurate, the truck will not, on it's own, top off the battery in many cases because of the time it takes. That makes a trickle charger even more important for longevity since it can be on the 12v battery for many hours at a time charging even when the truck HV is not.

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