HYBRID 12V Battery Mystery SOLVED

[HeyBales]

Update:

I kept 12v battery 96% minimum while parked and 100% while driving for over 3 months.

This week Mon-Tue-Wed I kept parking lamps off (DRL on).

Wednesday night, parked at 90%.
Same 4% drop overnight.

Thursday AM left home with 86% showing. No tricks.
Truck started charging at about 20 amps. Quickly dropped to 14 amps. Then 10 Amps at 90%. 91% came around.

Then I got distracted by driving for 2 or 3 minutes. ()

Looked at gauge: says 90% and flat.
0 amps neither charging nor discharging. Holding steady at 90%.

After a few more minutes I flip parking lights on. Instantly 10 amps charging with a slow taper.

9A at 91%
8A at 92%
5A at 95% etc.

Hit 98% at same time I got to destination. Parked at 98% on 12v battery.

That's interesting it takes such a nose-dive of Amps to float charge around 90/91%.
Like mine, I'm sure that PID shows 0, but it's actually 0.5 abouts with a different PID.

So it is willing to do nice higher charging until close to the 92% max.
I was wondering if like the 80% on SLA - that's where it started it's float level, until 85%.
That is good to know you can get above the float charge level if the SOC% is high enough.

Wondering what your morning resting Volts was at 86%?
You've mentioned no overnight locking normally right - so no alarm enabled for micro-drain?

I've noticed great variance in SOC% at same resting Volts, with big difference in temperature.
But yours is pretty even temps? Or come home hot, much cooler in morning?

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[Mavster Mechanic]

That's interesting it takes such a nose-dive of Amps to float charge around 90/91%.
Like mine, I'm sure that PID shows 0, but it's actually 0.5 abouts with a different PID.

So it is willing to do nice higher charging until close to the 92% max.
I was wondering if like the 80% on SLA - that's where it started it's float level, until 85%.
That is good to know you can get above the float charge level if the SOC% is high enough.

Wondering what your morning resting Volts was at 86%?
You've mentioned no overnight locking normally right - so no alarm enabled for micro-drain?

I've noticed great variance in SOC% at same resting Volts, with big difference in temperature.
But yours is pretty even temps? Or come home hot, much cooler in morning?

Mine is locked all day at work and mine is locked all night at home.

I park always 20-30 degrees warmer than leaving the next morning.

 

[Mavster Mechanic]

Fan speed 6 or 7 forces charging.

But ya know how the fan goes down when you make or take a phone call? What then?

CHARGING STOPS when the fan drops during the phone call. And RESUMES after the phone call.

 

[Techcar]

Good information but flawed case study. Just like CR when they test 1 vehicle randomly purchased. If they happen to get that 1 destined to be bought back as a lemon they condemn the model. Same here. He could run the same tests on 1000 of each batteries and then it would be more conclusive.

So maybe you can run the test correctly and come back and let us know how it goes.

 

[MavStangVa]

So maybe you can run the test correctly and come back and let us know how it goes.

Send me 5 million in small bills and I will get right on it. However you are more than welcome to follow the advise of a youtube posted "test" result if you choose.

 

[CrammyHamilton]

In the effort of not having to read 51 pages of comments on this topic, are you saying that as a guy who likes to drive around with his marker lights every time I drive, this simple action forces the battery to kick into a "true" charging mode and will "fix" the deep sleep issue? From your research it sounds like my personal aesthetics preference is a happy accidental cure.

I drive 86 miles round trip for work every day and always turn on just the marker lights whenever I drive (I always just loved the way a vehicle looks this way as compared to using DLR, especially when your near sunset). Ford replaced the defective battery that was in my XLT a week after I got it and put in a Ford AMG and I have not received a single Deep Slate notification since. I've charged the AMG completely one time when we went to Guatemala for a week, came home, and did the BMS reset. She has been a dream ever since.

Thank you for your hard work.

 

[Techcar]

Send me 5 million in small bills and I will get right on it. However you are more than welcome to follow the advise of a youtube posted "test" result if you choose.

That would be better than trusting someone that doesn't test at all and who could That be?

 

[inline_five]

In the effort of not having to read 51 pages of comments on this topic, are you saying that as a guy who likes to drive around with his marker lights every time I drive, this simple action forces the battery to kick into a "true" charging mode and will "fix" the deep sleep issue? From your research it sounds like my personal aesthetics preference is a happy accidental cure.

I drive 86 miles round trip for work every day and always turn on just the marker lights whenever I drive (I always just loved the way a vehicle looks this way as compared to using DLR, especially when your near sunset). Ford replaced the defective battery that was in my XLT a week after I got it and put in a Ford AMG and I have not received a single Deep Slate notification since. I've charged the AMG completely one time when we went to Guatemala for a week, came home, and did the BMS reset. She has been a dream ever since.

Thank you for your hard work.

FWIW I have only experienced battery saver modes when the vehicle has decided to do a deep draw on its own. Normally right after parking, lasting for several hours. No idea what it's doing and it happens randomly.

No amount of additional charging would have saved me from that deep draw.

 

[HeyBales]

In the effort of not having to read 51 pages of comments on this topic, are you saying that as a guy who likes to drive around with his marker lights every time I drive, this simple action forces the battery to kick into a "true" charging mode and will "fix" the deep sleep issue? From your research it sounds like my personal aesthetics preference is a happy accidental cure.

I drive 86 miles round trip for work every day and always turn on just the marker lights whenever I drive (I always just loved the way a vehicle looks this way as compared to using DLR, especially when your near sunset). Ford replaced the defective battery that was in my XLT a week after I got it and put in a Ford AMG and I have not received a single Deep Slate notification since. I've charged the AMG completely one time when we went to Guatemala for a week, came home, and did the BMS reset. She has been a dream ever since.

Thank you for your hard work.

The time for the 86 mile drives wasn't hurting either!

But as the updated 1st post told you - that would only get you up to 91% SOC charged.
Your preference has indeed saved the day. Or at least 12VB.
And will continue to.

Well, unless you have some parasitic drain one evening. Even that long vacation probably not that bad.
It does seem the SOC% needs to be high enough for it to even reach 91% in normal driving, then The Tricks will work. And your long drives should get you up there.

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