For my car the battery deterioration has not been linear. It began fast but after 40,000km has slowed down. I have sold my Kia Soul EV previous year (7 years old too) in July 2021 (replaced with IONIQ 5) when there was 145000 km on the odometer with still 91% SOH. https://www.dropbox.com/s/ix9l9van...

Thank you both, this is very helpful! After each charge cycle (< 20% to 100%) the range starts to decrease. It went from 140, 130 and now at 120 km (while weather is getting warmer). At 100% charge the SOH is still 42,8%, battery cell map looks the same but with higher values around 4.00. ... At 10...

Thanks for your replies! To make my case against Kia here, I am going to write them a report and letter. They are in terrible denial and tell me this car is normal. Sorry for asking so many questions, but here we go: .... Kia can also read out the SOH with their Kia KDS system. Here are 2 readouts ...

Apparently your BMS has been recalibrated anyway and the SOH% is bad. You do not need to measure this at 100% SOC. So it is below 70% SOH and you should get a replacement battery under guarantee (assuming the service intervals have been done by the previous owner).

Haha thanks! They called me back and told me indeed it has to be above 10ºC. So they found out :D . As I have no possibility to charge indoors, I'll have to wait for warmer weather. Is it really true that they cannot determine a SOH when the BMS is not calibrated? They just read out what the BMS th...

https://www.facebook.com/groups/1543242002564112/?ref=share - The group is private though I’m not sure how to check if I have a battery heater or the number of the update that messed up the heat pump. But apparently it wasn’t part of the e-brake update, but a service action regarding BMS/FATC they ...

kiaaruba wrote:Thanks for reply, but what are typical values for good cells and what is the voltage a battery goes bad?
Further can one cell dropped in voltage to 3.74V have such high impact on millage with full charge.

See this article of battery university: BU-803a: Cell Matching and Balancing.

For me the reason to have an software update was this recall for the EPB: ELECTRONIC PARKING BRAKE (EPB) LOGIC IMPROVEMENT(SC191). And while applying it, they found also another software update, which they told me was related to airco and charging. Which one, I do not know, but suspected SA427.

Thus, I doubt your vehicle would have had the same FATC update that was done on mine and some others (2016-2017 model years). I point this out only because I do not want to confuse the issue, and it would seem that we are finally starting to narrow down the cause of this problem. I do indeed not kn...

How can I check I have a battery heater? If you look at torque there are two values for the temperature of the battery heater. Without a heater those 2 values are always zero because the necessary sensors do not exist. Hmm, Torque gave me -50.0 C as answer for both. This is what I have in the .csv:...