Even if it is a 'lucky' second bad battery, it wouldn't hurt to check your connections and grounds. A little di-electric grease is your friend when you clean and tighten things as well.

The truck should not bat an eye in 50 degree weather, it should not in -40 either.

 

Yesterday the called me back. They did a battery test, battery passed. Naturally it started no problem for them. I had them keep it over night to see if it would do it (or in this case not). Of course it started for them with no issues.

So not really sure what's the deal at this point. They mentioned that maybe I'm not turning it "off" or leaving something on, but I know that is not the case. I honestly think it's a ground issue, but have no easy way to trace it down let alone prove it.

I trust the dealer and my next comment is more a gripe at the industry then the dealer, but the inability for mechanics to troubleshoot amazes me. I hate the "unless it throws a code" comment. It's called deductive reasoning. Make a list of possible issues, start with the easiest and work form there. Just because the computer says there is not issue doesn't make it so.

 

12.1v is only 25% charged so maybe a relay is stuck causing parasitic drain?
I agree about !
I usually diag myself then tell the dealer what it needs and I wont except it until its done right.
My wifes battery was at 12.1v last weekend and started fine, But this is an easy time to replace it before it just fails. 12,000 miles 2017 rav4.
Here birthday gift was a remote start via phone app and it shows battery voltage - Saved my butt for sure.

 

Well this morning I went to start it and as luck has it. It did not fire. What is odd, and maybe this is a coincidence, but I opened the drivers door then passenger rear door to put stuff it. No issues. Did it a couple more times, no issues. Went to open the lift gate about 10 minutes later (again it's an expedition) and a power lift gate, and sure enough dead battery. Goes into power saver mode and doesn't have enough juice to start. I'm not sure if the lift gate is the issues (as odd as that sounds) because when I had issues last time it was similar. Or at least that is what I recall. I open drivers/passenger doors, no issue, then open the lift gate and bam dead battery. I'm not sure how the BMS system is tied, but maybe there is a short within the lift gate that cause a short. Or there's enough "reserve" in the battery to "power" on when you open the door. But by the time I load up the kids and random crap go the battery is "drained".

Maybe we are retarted and think we are turning off the car but we are only shutting off the engine and not the acc. power. Or something is actually is draining the battery. This assumes they actually tested the battery and it tested okay. I didn't see the actual test report only the note on the invoice saying it was tested and passed. When I get off work today I plan to check ground connections and chase that out too. May end up pulling the battery and having it tested at AutoZone as a CYA, or swapping batteries with my F150 to eliminate the battery as the issue. The struggle is truly replicating the issue even on a semi consistent basis. .

Regardless, I'm talking with the dealer to get it ironed out. But this is an odd one. 2018 (bought in July 2019) with 7,589 miles on the OD. Fairly concerning and getting to the point of saying F it and let the dealer keep it until they fix it and they can give me a loaner.

Oh and sorry for high jacking this thread in an F150 forum about a expedition, but they are similar issues with similar systems.

Thank you,

 

No need to apologize and hope the dealer can figure it out!!

 

Absolutely no need to apologize. I’m interested to hear how this turns out and more fascinated to see if I end up with the same thing. Any data here could be useful if something comes up on my side. Let us know!

 

Actually, 12.1V is closer to 50% charged.

 

Probably better to read the whole thing, but basically letting it get down below 12.4 (considered discharged on a car battery) isn't a good thing.
https://www.ecosoch.com/lead-acid-battery/

 

They "tested the battery" probably means they load tested it, which means they would probably put it on a charger before the test. Then the next morning the truck starts readily . They need to and you must insist they load check the electrical system. That would require putting a meter on the mains to measure current draw at static state. This is sitting idle with the ignition in the off position for a period long enough to let the energy management system shut everything down. In a modern vehicle, probably the last 20 years or so, there will be parasitic current loads from certain electronics but these would be minuscule. They need to monitor the current draw and verify that the energy management is shutting things off. I would venture a guess that there is something not shutting off and/or the energy management not coming into it's mode.

 

My 2019 did that early . trickle charged it overnight and the problem went away came back after warrantee. dash blacked out and wrench light on. took to dealer and they could find nothing. sold me a new battery for $350. seemed to fix it for now. Go to dealer. they will probably do the same and cost you nothing.