New 12V battery drain in 3 days!

[GPSMan]

For what it is worth, I have a Ham radio directly connected to the 12V battery under the seat. Several times I had forgotten to turn it off after parking in the garage. The control head is in the middle of the dash. The repeater it is set on has very little activity. I have discovered that even after 2 days of sitting, It started. The truck started with no problems and no warnings or other signs of a low battery. The truck is a 22 Lariat with all the bells and whistles except for a sun roof. It looks like I was fortunate enough to get a good one with no problems after a year.

Here's mine:

I'm over a year into ownership.
The truck has never not started.

But every volt meter I attach to it shows lower than typical voltage.

Ford says I don't have a problem.
Maybe I don't.
But still more than a little weird.

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[BlueSpec1]

The 300A ZCASE Fuse bolts in. Costs $12.52 + shipping from Mouser.
https://www.mavericktruckclub.com/f...-volt-battery-drain-problem.31260/post-572719

 

[MakinDoForNow]

I don't know if the tech can see all that, I kind of doubt it. That is A LOT of data for Ford to store on their servers for how ever many days/weeks/months.
I can tell you they kept my truck overnight for 3 days to find the draw from the alarm.

There is a lot of data some is kept and some is not. A big problem is getting it delivered to be seen by someone like your tech. But the day is just around the corner that he will also have the serial number of your dashcam and the date it was installed etc. memory has become ultra cheap

 

[paneubert]

Here's mine:

I'm over a year into ownership.
The truck has never not started.

But every volt meter I attach to it shows lower than typical voltage.

Ford says I don't have a problem.
Maybe I don't.
But still more than a little weird.

I am with you. Same situation.

Got curious yesterday and put a quality volt meter directly on the battery posts. This was after it had been sitting for about 6 hours. 12.4V. Slightly concerning..... Later than evening, tested it while running to see what the alternator was putting into it. 14.8V. Which is the top end of what is usually considered safe/normal. So no charging system problem (at least not an obvious one). Voltage right after turning off engine was 12.7V. Normally that would be great, but I knew it needed to sit for a while to get an accurate/actual reading. Waited overnight and this morning it is at 12.1V........

But has never had a problem starting. Never had a Deep Sleep warning. Cheap $20 Amazon battery tester tells me it is fine, but undercharged. Only 6 months in and have not put it thru really cold temperatures yet. Park outside......so will be an interesting thing to keep an eye on this winter.

 

[GPSMan]

I am with you. Same situation.

Got curious yesterday and put a quality volt meter directly on the battery posts. This was after it had been sitting for about 6 hours. 12.4V. Slightly concerning..... Later than evening, tested it while running to see what the alternator was putting into it. 14.8V. Which is the top end of what is usually considered safe/normal. So no charging system problem (at least not an obvious one). Voltage right after turning off engine was 12.7V. Normally that would be great, but I knew it needed to sit for a while to get an accurate/actual reading. Waited overnight and this morning it is at 12.1V........

But has never had a problem starting. Never had a Deep Sleep warning. Cheap $20 Amazon battery tester tells me it is fine, but undercharged. Only 6 months in and have not put it thru really cold temperatures yet. Park outside......so will be an interesting thing to keep an eye on this winter.

And this is an EcoBoost?

 

[paneubert]

And this is an EcoBoost?

Yep. No powered accessories other than a dash cam that is wired into the OBDI port and turns off after 5 minutes of the vehicle being off. Like clockwork.

 

[GPSMan]

Yep. No powered accessories other than a dash cam that is wired into the OBDI port and turns off after 5 minutes of the vehicle being off. Like clockwork.

Odd the EB and Hybrid are having similar symptoms.

 

[paneubert]

Odd the EB and Hybrid are having similar symptoms.

From reading a lot of these "battery issue/deep sleep" threads, I am starting to see a lot of people finding that the BMS is only charging the battery up to something well below 100%. Which would explain some of this low voltage. I'll tell you what......when I get closer to 36 months of ownership, I'm going to be testing my battery religiously to see if it is still "healthy" according to the scanner. If not, I'll be hounding my dealer for a replacement under warranty.

 

[GPSMan]

Yup. 3 yr / 36 mile REPLACEMENT is what I was told. Not a proration.

So a new battery at month 35 is not exactly horrible.

 

[Packer Bill]

From reading a lot of these "battery issue/deep sleep" threads, I am starting to see a lot of people finding that the BMS is only charging the battery up to something well below 100%. Which would explain some of this low voltage. I'll tell you what......when I get closer to 36 months of ownership, I'm going to be testing my battery religiously to see if it is still "healthy" according to the scanner. If not, I'll be hounding my dealer for a replacement under warranty.

I believe the BMS limits the battery charge level to 80%. Some Mav owners have claimed to changed this level to 90% or higher via Forscan.

 

[MavTime]

Thanks for this... I'm gonna give this a shot tonight. Hopefully there's still good voltage on the battery. I highly doubt my battery is drained.

You might want to disconnect the battery to charge it. I had been topping my 12v battery off with a Noco Genius 1 maintainer with the battery in the car and had no problems, but put it back on this weekend and it discharged down to 8v. I'm not sure if a relay stayed latched or something stay on, or if the Noco was at fault. I disconnected the battery from the truck, leaving it in the truck, and let the Noco do a full slow charge and repair mode. You might play it safe and disconnect the battery.

 

[GPSMan]

I believe the BMS limits the battery charge level to 80%. Some Mav owners have claimed to changed this level to 90% or higher via Forscan.

Well not really. In a hybrid.

On vacation getting to the destination I drove five, 10 hour days in a row. All highway. California to Alaska.

When I got there, my scanGauge read 99% charge.

My 1 hour commutes never get me above the high 60 percents.

This damn thing just charges at a trickle rate.

 

[Silver23]

Well not really. In a hybrid.

On vacation getting to the destination I drove five, 10 hour days in a row. All highway. California to Alaska.

When I got there, my scanGauge read 99% charge.

My 1 hour commutes never get me above the high 60 percents.

This damn thing just charges at a trickle rate.

The type of guy you are (tech savvy), I'm surprised you haven't used Forscan the set your charge rate to 90% or so....
Just FYI, Forscan shows my truck to be set to 80% charge and an AGM battery.
I have not had any notifications sense my dealer alarm was disconnected, so I have not changed it

 

[MakinDoForNow]

Odd the EB and Hybrid are having similar symptoms.

Bms following similar if not identical programming. Is becoming to appear that Ford along with others are trying to get by with one smaller than optimum sized AH batteries. Perhaps two larger batteries would help. I feel that there is fear of overcharging batteries and/or charging too fast resulting with fear of charging past 80-85%. The life of 99.99+ % lead batteries with at least monthly maintainer sessions may have arrived into my garage.

 

[Tim d]

Good morning fellow hybrid mavericks. I bit the bullet and replaced my 12V battery because my truck would occasionally be dead in the morning and I would have to jump the 12V to get the car to turn on. Anyhow changed it out last Sunday and at 3am this morning, three days later, got a notice from my ford app that it went to sleep mode. Are there any modules i need to turn off such as WIFI or anything I can do to check where the electricity drain is coming from?

My add-ons are I have two amps powering my sub and speakers, I have a blackvue dashcam that's powered at the fuse box passenger side. I don't have my dashcam running while in park due to battery drain. Getting annoyed, I may need to take it to the dealer but I feel like they always give me the run around. Just want to check and do it myself if possible.
[/QUOT factory automotive batteries should last 8 to nine years. Either there is something wrong with the hybrid electrical system , or Ford went way cheap on the battery for this vehicle!

Good morning fellow hybrid mavericks. I bit the bullet and replaced my 12V battery because my truck would occasionally be dead in the morning and I would have to jump the 12V to get the car to turn on. Anyhow changed it out last Sunday and at 3am this morning, three days later, got a notice from my ford app that it went to sleep mode. Are there any modules i need to turn off such as WIFI or anything I can do to check where the electricity drain is coming from?

My add-ons are I have two amps powering my sub and speakers, I have a blackvue dashcam that's powered at the fuse box passenger side. I don't have my dashcam running while in park due to battery drain. Getting annoyed, I may need to take it to the dealer but I feel like they always give me the run around. Just want to check and do it myself if possible.

Factory automotive batteries should last 8 to 9 years. Either there's something faulty with the hybrid electrical system, or Ford went way cheap on the factory battery!

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