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Battery dying…a second time?

2446 Views 22 Replies 9 Participants Last post by  Vandy1981
So I am one of the people who got the dreaded wrench icon between the Thanksgiving and Christmas holidays. If I remembered which post I’d piggybacked on, I’d link it here; but long story short: the icon came up and I started noticing issues with having 90% available power, roughly, to my vehicle.

I called the dealership and was originally told they wouldn’t be able to get me in for several weeks. The advisor later then called me back and said no the technician says it’s got to come in immediately. I ended up in a Ranger and then a 250. All in all I was without my truck for about two weeks. I was told to the 12 V Battery was the problem and that certain modules weren’t communicating with the truck. However, I was assured that the actual big battery itself passed all its testing.

Fast forward to last week and this week and I’m starting to notice the same thing happening with not having full 100% battery power available to me. We had some mild weather and then a drastic freeze and are back to mild again.

I am noticing this problem happening when temperatures are actually well above freezing. See the photo below, at the time I got in the truck to leave work it was 58°. The high temperature today was 65. The low temperature the night before was in the high 40s. And the truck is parked in the garage.

The morning that this picture was taken ie yesterday morning, I went to remote, start Beast (what I lovingly call my truck) and ford pass displayed an error I’ve never seen before. It said something along the lines with the truck couldn’t start. Not a failed communication but something else. I tried several more times and then happened to notice that the app said my charge was down to 37% with an estimated range of 89 miles. I was well over 50 or 60% when I parked the night before so this seemed crazy- especially for temperatures that didn’t make it under the high 40s that night before. I had to physically go downstairs and the truck would not start with phone as a key either. I actually had to get a key fob before the truck would start. I did plug it in. It’s stayed on the charger while I went about my morning routine maybe about 45 minutes or so. Drove to work just fine. Vampire drain was literally 1 mile during the time I was at work.

And then, I get in start the vehicle and this is what I see:
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(Yes, the photo was taken while I was driving and I was on Bluetooth with my hubs – again for those who would have a negative comment otherwise: I am a she)

I can see no good reason for the battery to only give me 91%. Battery temperature was within range and ambient temperature was 58°. This is probably the fourth or fifth time this is happened since the repair; though, this is the lowest amount of charge I’ve had when it’s happened. I’ve literally had it happen rolling out of the driveway to go to work after pulling beast off of the charger at 100%

The only common denominator is it has always happened at 40°F and above for ambient outside temperature. I’ve actually only once had it happen when the outside temperature was well below freezing say in the 15°F range. Otherwise, the other three to four times have all been warm weather with the SOC (other than yesterday) over 60%.

at this point, I don’t know what to think. I really don’t want to be stranded where I can’t get home from or get into work. Or worse, stranded out in the community somewhere. But on the same level, I hated my experience going back to ICE with the loaners at the dealership. The Ranger was too small and felt like a cheaply made roller skate. The F250 suited my style, but I certainly didn’t enjoy not wanting to drive because I knew how expensive gas was. Maybe as temperatures are warming, a sedan or an escape will be fine.

Advice? Would you guys wait and see what happens after the stop build has lifted or would you just take it back into the dealership now?

ETA: build week 13 May 2022. Truck dropped at dealership 3 June 2022; took home next day 4 June. Issues started at approximately 5000 miles. Lariat ER AM Blue

tagging @Ford Motor Company
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I am noticing this problem happening when temperatures are actually well above freezing. See the photo below, at the time I got in the truck to leave work it was 58°. The high temperature today was 65. The low temperature the night before was in the high 40s. And the truck is parked in the garage.
The battery likes to be >70 degrees and ambient temperature effects are going to be worse at lower states of charge like you showed in your photo. 58 degrees would be enough to reduce available power under that scenario.

Your other concerns seem to be app bugs and not truck issues. I occasionally have trouble with PAAK and starting the truck with the app, and the trip logs are unreliable. I haven't noticed variations in state of charge in the app but I haven't been watching that closely.

I personally wouldn't worry about this. Maybe you could precondition the battery to see if you have the same issues with available power?
So if that were true, why is it that the entirety of the fall and winter this problem never occurred?
I'm not trying to be cheeky, but maybe confirmation bias?
I don’t need you to be cheeky and I don’t need you to be biased. I need you just to either have a good advice or don’t bother to respond at all.
I don't think you're going to get a satisfying answer on the forum--just take it to the dealer if you're worried.
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So let me get this straight you think that because the battery temperature readings were within range but because it wasn’t 70° outside that’s why I get 91% battery?
Yes. That's exactly what I'm saying. Unless you have looked at your battery temperature with an OBD reader and can confirm that it's in a good range--the battery temperature gauge on the dash is useless outside of extreme temps. The battery is about 2000 pounds of thermal mass so if it was 40 degrees the night prior it's not going to be equal to ambient temperature later in the day, even if the high temperature was 70 degrees.

And again my question to you with the same logic is that given where I am ambient temperatures drop below 70 sometime in October yet this didn’t even become an issue at that time. And given that the ambient temperature won’t be above 70 again until May or April yet this is only happened five times in total.
What was the battery temperature during each of those episodes, as measured by an OBD reader?

I don’t need you to be cheeky and I don’t need you to be biased. I need you just to either have a good advice or don’t bother to respond at all.
My apologies for trying to give reassurance and feedback in my first post. Just take it into the dealer if you're worried.

Edit: It wasn't clear to me whether you concerned about the traction battery or 12V battery in your original post. It is certainly possible that your 12V battery has gone bad, especially if they didn't replace it last time you had issues. This can cause all sorts of weird errors and the 12v battery is also going to have weaker potential in cold weather. Any battery store can test your 12v battery if you don't want to go to the dealer. You can also keep a lithium jump starter battery in your truck for added peace of mind about getting stranded.
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I noticed after the DTE update, that I progressively lose power as the battery gets closer to 0. I was thinking it started around 25-30%, but not exactly sure as I don't think I noticed right away.
Any chance this is what is happening?
I noticed this behavior before the DTE update, especially in colder temps. Maybe the update has made the power reduction more aggressive. It's hard to make any conclusions because I'm sure the algorithm that's used uses multiple factors that will vary between driving sessions and ambient weather.
Here's another data point: I had 92% of power available at 27% SOC in relatively mild 50-60 degree weather. It's 100% at high SOCs. The battery temp indicator is at dead center. I haven't noticed any battery degradation or other gremlins so I think it's completely normal behavior.


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