Lost 16% charge sitting in garage

[CD4TNF]

Do you happen to have something like car scanner to check the voltage and soc variation? Could be a cell on the way out.

Negative. I do not have an OBD2 dongle for that. Don't have the extra cash to shell out. Good thought to use car scanner to rule out the bad cell hypothesis.

I would have expected the motor power output % to decrease if a bad cell were lowering the voltage.

I'm going to have faith in Ford's BMS/battery health monitoring system giving me a warning if something is wrong.

There's probably an Occam's Razer explanation like software messing up.

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[PJnc284]

Negative. I do not have an OBD2 dongle for that. Don't have the extra cash to shell out. Good thought to use car scanner to rule out the bad cell hypothesis.

I would have expected the motor power output % to decrease if a bad cell were lowering the voltage.

I'm going to have faith in Ford's BMS/battery health monitoring system giving me a warning if something is wrong.

There's probably an Occam's Razer explanation like software messing up.

Bad thing here is that you might not realize or get an alert right up until the time it leaves you stranded. @bmwhitetx pretty much predicted his pending module failure recently by tracking the voltage variation heavily. Something like https://www.amazon.com/Veepeak-OBDCheck-Bluetooth-Diagnostic-Supports/dp/B073XKQQQW is only about $30 and would be very cheap peace of mind imo. You can get then get the data from the Car Scanner app on Android or iPhone for free.

 

[TaxmanHog]

This is where my head went. Not sure if it's possible now, but can @FloridaBreen look at "Trip 1" stats again and see what the trip timer reads? That way you could see if someone turned on the truck as the timer would capture that time the HVB was being used.

I was interested in seeing this statistic also, would lend credence to the teen listening to dad's sound system on the garage, might have been tempted to back out the truck but then realized that would log miles so they pulled it back in.

 

[GoodSam]

Went from 96% SoC to about 66% SoC over the course of about a short 19 mile drive

Maybe this:
SSM 53208
"Some 2022-2023 F-150 Lightning vehicles may exhibit a reduced distance to empty (DTE) projection, a high voltage (HV) battery pack state of charge (SOC) that drops from 100% to less than 90% within 60 seconds of being driven, and an inability to reach a target SOC using the scheduled charging feature without any diagnostic trouble codes (DTCs) in the battery energy control module (BECM). This may be due to an issue in one or more cells within the HV battery pack. To correct the condition, run the "BECM Battery Health" application using the latest software version of the Ford Diagnosis and Repair System (FDRS). If any cells are identified as exceeding state of charge and/or capacity thresholds, refer to the Workshop Manual (WSM), Section 414-03A High Voltage Battery, Mounting and Cables > Diagnosis and Testing > High Voltage Battery, Mounting and Cables - Electric > Pinpoint Test AP > Step AP4 and continue diagnosis. If all cells are within state of charge and capacity thresholds or DTCs are present in the BECM, refer to the WSM for normal diagnosis."

 

[CD4TNF]

@PJnc284 @GoodSam

Thank you both for the info and concerns. I'll see what I can do with both of you expressing valid concerns. My experience raised a red flag in your memory so I'll take it seriously.

Looks like we have old threads on that notice

https://www.f150lightningforum.com/...pack-soc-unable-to-reach-target-charge.23075/


https://www.f150lightningforum.com/forum/threads/truck-refuses-to-charge-past-84-87.26182/page-2

 

[chl]

Just adding a data point. I also just experienced an unexpected loss of battery % while driving on Mar 14th.

Went from 96% SoC to about 66% SoC over the course of about a short 19 mile drive. Around a 30% decrease or 40kWh. Unexpected amount for the distance covered.

Motor power was showing 100%. Energy usage showed around 80% energy used by the motor, everything else was single digits.

Very different situation than OP. I'm guessing mine is a one-off unbalancing of cells. Been two or three months since I did a rebalancing.

I haven't gotten any warnings so I'm not worried. Next time I get a chance I'm going to charge up to 100% to rebalance.

That's a crazy amount.
I'd be thinking about a bad module if I saw a big drop like that.

 

[DerMot]

I agree, charge up and check, only thing I can think of is that the 12v is on the fringe. So its wasting energy just keeping it topped up, but then you'd have the only Lightning that actually tops up like it's supposed to so
¯\_(ツ)_/¯
As far as the 0.3 miles goes, you have them install the rollaway recall yet?

Know this guy?

 

[chriserx]

Know this guy?

That's the guy that was convicted of making that other guy's eyes dry right?

 

[Nikos]

My concern is where did 16% of charge go. Tbh I don't know if I put it in gear once or twice between Feb 13 and today, almost positive it didn't travel more than a foot or 2. I recall planning on driving it once but noted that the charge was low 27% and deciding not to take it for a 60 mile trip. It's been a while since I last charged it to 100% to balance the cells. I rarely drive much more than 30 miles round trip and don't drive it more than a couple times a month. Looking back I realized the really cold days were earlier than Feb 13. It's charging to 90% and I'll be taking it for a drive tomorrow 50-70 miles round trip. Plan to recharge it to 100% then see what happens. I've never fast charged an don't have time to get it to 100% before tomorrow's trip.

Charge the truck to 100%. Let it sit for an hour past completely charged. Since you haven’t gotten it to 90%+ for some time, the truck may need to charge to a higher level, near 100%.
Odd things may happen. You may see the truck charge to 350 to 360 miles range. Another thing to consider is did you kept waking up the truck all this time to check on its condition, willingly or unwillingly. Check the APP for the settings. Never had my truck drained of that much battery energy since I got it. I have traveled many times for more than three weeks and left the truck outside my garage. Didn’t disturb it from its sleep even once. No battery drain even after 3 weeks of inactivity.
Here is a story familiar to me. I was one of the fortunate owners who was able to track the Lightning’s progress since it left the factory in Detroit. Ford dropped the truck at the rail yard with 54% SOC.
Since I found out I was capable to communicate with my truck, I kept waking it up every few hours to track its movements towards me. It took almost 30 days to see my truck at the dealer.
As I said, it had 54% and arrived at the dealer with 51%. Since it was the first Lightning at the dealer, there was one of those “let’s take it for a spin to see what it can do”, kind of thing. They brought it down to 48%.
My constant tracking brought the battery down after nearly 30 days by 3%. Check your settings, you may be telling or asking your truck to do something you’re not aware of.

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