HVB SOH 80%

[louc757]

I had the same issue I noticed a few months back. I was down to 88%. There is a lot of different views on how to charge. I read on the forum to charge everyday, even though my normal drive is only 40 miles round trip, and I use only 16-20%. What I have since learned is that the battery likes to be deep cycled more. I now take it to 15-30% before I charge. Then I charge to 90%.

Once a month I charge to 100%. That is key because that is where the electronics does it magic in cell balancing. 100% is NOT a bad thing. If you need it for a trip, then do it. It actually helps than hurts.

Since using the methods Mach Lee posted, my SoH is now 92.5. You get a lot of advice here on the forums, some of it bad. Find what works for you and go with that.

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[BillTinVT]

Thanks! It’s encouraging to hear that the calibration can have a significant impact on the SOH. My daily charging habit comes from my previous experience owning a Chevy Volt. With 50 miles of range (depending on conditions), charging to 100% was the obvious thing to do.

 

[mkhuffman]

Well, I’ve started the calibration with the first easy step. Charged to 90%. Now I need to drive 250 miles to get my SOC down below 10%.

My daily commute is now 20 miles due to multiple construction projects that I like to avoid. With that and some unnecessary road trips, I can probably get down to 10% by the weekend. Just need to pick a good time to be without the car for a day while it rests and recharges. The kWh at 99% is not encouraging

I am confused why you charged to 90% instead of 100%. You need to fully charge for the BMS to establish what a "full" battery is. It is the uncalibrated full and empty battery that throws the BMS off.

I think the BMS would be most accurate if you ran it down to fully empty, meaning it is dead, and the charged it back to 100%. But it is definitely not good to fully discharge the battery. Fully charging it isn't nearly as harmful, and much easier to do. Just do it. But don't wear those shoes. Lol.

 

[BillTinVT]

I'm following Mach-Lee's calibration procedure here: https://www.macheforum.com/site/threads/hv-battery-calibration-procedure.23815/

I will charge to 100% after I drain it down to below 10%.

 

[bbulkow]

Thanks! It’s encouraging to hear that the calibration can have a significant impact on the SOH. My daily charging habit comes from my previous experience owning a Chevy Volt. With 50 miles of range (depending on conditions), charging to 100% was the obvious thing to do.

Yeah, reading the manual is thing.

I suspect your battery is not damaged. If it is, well, 70 SOH gets you a new battery! But if you start charging as per the manual, SoH will improve.

I also have a ER MNH. My charge is set to 85 percent. Every month I try to get below 30 percent, and charge to 100 percent (for balancing). I believe the manual says at least one to full charge per month.

My soh is a bit above 92 pct.

 

[YeOldeTraveller]

17K miles and SOH of 99%
I charge to 70% at home as I don't need more range and my daily is 20-30% depending on weather.

I also do a road trip about every other month, so the BMS sees >90% and <10% regularly.
I also don't drive every day, so there is even rest time in the mix.

 

[BillTinVT]

After completing steps 1-5, step 6 results are not great....

Procedure (NCM packs):

1. Charge the vehicle to your normal level (e.g. 90%).
2. Drive the vehicle (without charging) until the battery is down to 5% or less.
3. Park the vehicle and let the battery rest for at least 5 hours (preferably overnight)
4. Level 2 charge all the way to 100% in one session without interruption.
5. Leave the vehicle plugged in and let the battery rest for 3+ hours after 100% is reached.
6. (Optional) With a scan tool, read the kWh to empty and state of health parameters.
7. Drive without charging until battery is below 50% (10% recommended)
8. Charge the vehicle back up to your normal level.
9. Repeat if desired.

 

[mkhuffman]

The EtE value is also very low, and correlates pretty well with SoH. Unfortunately. I suspect it won't get much better based on what I saw in my MME. But a few more charges to 100% can't hurt IMO.

 

[Mustangor]

Thanks! It’s encouraging to hear that the calibration can have a significant impact on the SOH. My daily charging habit comes from my previous experience owning a Chevy Volt. With 50 miles of range (depending on conditions), charging to 100% was the obvious thing to do.

For me, Mach-Lee calibration process didn't change the HVBSoH whatsoever. The value is still 91% for my 15 month old Mach-E with 19000km, *but* IDGF to this because my range is still 400-420km on a single charge for my typical trips .
Conclusion : don't take this HVBSoH value too seriously...

 

[BillTinVT]

Thanks for the replies. I'm not going to worry too much about this. The range is more than enough for my needs including on a recent 1800 mile road trip. I am curious why my numbers are so low after only 17 months of ownership and 16,000 miles.

I'm going to continue with the rest of the calibration process and maybe try it again in a few weeks. I'm also tracking how many miles I get from 100% to 10% SoC displayed. From 90% down to 9% it was only 209 miles. That surprised me.

One more question, Charging from 9% back to 100, my Ford Pass app reported 80kWh energy added, my charger reported 87.19kWh added while my Energy to Empty was only showing 76.35kWh, how does that align with what others have seen?

Thanks,
Bill

 

[flapjake314]

i've been keeping an eye on this thread because i had created a SOH tracking dataset here and this would be the lowest SOH seen thus far

overall i wonder what the ford method for testing / validating the battery for warranty purposes is. it seems like you may indeed be on track for a warranty, but in some ways means it doesn't really matter.......

 

[Mache_Nor]

Thanks for the replies. I'm not going to worry too much about this. The range is more than enough for my needs including on a recent 1800 mile road trip. I am curious why my numbers are so low after only 17 months of ownership and 16,000 miles.

I'm going to continue with the rest of the calibration process and maybe try it again in a few weeks. I'm also tracking how many miles I get from 100% to 10% SoC displayed. From 90% down to 9% it was only 209 miles. That surprised me.

One more question, Charging from 9% back to 100, my Ford Pass app reported 80kWh energy added, my charger reported 87.19kWh added while my Energy to Empty was only showing 76.35kWh, how does that align with what others have seen?

Thanks,
Bill

As for energy added from charger and what actually went into the battery, your results aligns pretty well with mine. It’s about 10% (give or take some) losses. My battery seems to max out at around 85 kWh, but when charging it can go above 90 kWh added from charger if I went deep.

 

[Mach-Lee]

One more question, Charging from 9% back to 100, my Ford Pass app reported 80kWh energy added, my charger reported 87.19kWh added while my Energy to Empty was only showing 76.35kWh, how does that align with what others have seen?

Thanks,
Bill

Yeah that proves the SOH estimate is just off and your battery seems almost full health. Not sure why it’s not updating.

 

[BillTinVT]

i've been keeping an eye on this thread because i had created a SOH tracking dataset here and this would be the lowest SOH seen thus far

I've seen your SOH tracking data and I thought mine might be the lowest seen so far. Do I get a prize? I will probably add my data at some point but I wanted to do the calibration 1st and confirm that it's "valid" data.

 

[BillTinVT]

Yeah that proves the SOH estimate is just off and your battery seems almost full health. Not sure why it’s not updating.

I hope it's just the estimate that's off. My driving and charging habits might have confused the algorithm. Prior to running the calibration routine, the battery was never below 25% and seldom below 50%. Maybe it needs to see more data at the low end of the range. ¯\_(ツ)_/¯

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