Cells that are out of order are considered broken and that is not considered to fall under degradation and its 70% rule; therefore they are just replaced under battery warranty.
I have the same question in mind. I think the mechanic didn't really understand what they were doing. So I've contacted Hyundai UK customer support to ask for support on the issue.Why didn't they measure it at 100% SoC?
To be fair, 0.02V is 20mV. So it's pretty close on all the other cells. It could be an ADC issue where it only measures in increments of 0.02V for that particular view.I'm under the impression that classic Ioniq has all the cells balanced close to millivolts of each other not 0,02 volts. It is quite a quality drop if the facelift has such big tolerances! On top of that one cell can be so badly damaged that it can vary 0,49 volts from other cells.
There seems to be a battery manufacturing defect that occasionally impacts the 64kWh Kona Electric where a single bad cell severely impacts the range. I believe the 38kWh Ioniq use the same LG Chem battery cells. See this German thread for some more details. Drastischer Einbruch der Reichweite um gut 30% - Akku zeigt 100% - lädt aber nur effektiv rund 70% - Kona - Batterie, Reichweite • Hyundai Kona Elektro - Elektroauto ForumSo I got the battery health report from my local dealership. (Free of charge of course). It's shows 87 cells at 4.06V - 4.08V and single cell at 3.86V. This was at 89% indicated SoC after a full charge and 15 mile journey.
They said it's not bad enough to do anything about, but I got the impression that if I make enough noise about it they'll do a longer investigation. They said generally they class a bad cell as being over 0.5V different to the others.
Does anyone have in-depth experience of these big battery packs and can help me work out what to do next?
I suspect that if it was at 100% SoC that bad cell would be further away, but I'm not sure. Maybe it's time to look up the OBD thread and keep a closer eye myself!
Hi. After a long search I have now found the right posts. I have the same problem: I also wanted to load to 100% for balancing reasons - as described in the manual - and was then amazed at the very reduced range. OBD2 dongle in and EVNotify interviewed. And lo and behold: SoC display 100%, SoC BMS 74%, SoH 100%. Tried different things like driving completely empty and fully loading CCS again. Here too, premature reduction in charging capacity. The individual stages of the charging curve have been reduced by approximately 25% beforehand. The friendly Hyundai dealer was really friendly and read everything first. And then "deleted something from the error memory". Probably this error that always appears. And: has brought nothing. Now the apparently only knower (I'm really not sure ...) is on vacation for now. Me too. So everything is ok. Let's see what comes next. At least it is confirmed to me here that I am quite right in my assumption of a defective cell (car scanner shows strange values). Very annoying!!!
Oh yes: my car now has 12,500 KM "down" and is a ... IONIQ FL !. So far for that ...
And anticipating: otherwise I am very satisfied with the conscious choice of "FL" instead of a vFL or even TM3. Hope everyone get well soon
If I calculate 29.4/38.3, this is 77%, so also a loss of around 25%. These two cases have much in common....
E.g. 130 miles at 4.8 miles / kWh discharges from 100% to 8%.
130 ÷ 4.8 = 27 kWh used
Adjust for 8% remaining:
27 ÷ 0.92 = 29.4 kWh full discharge
Maybe you can show this to your dealer, @Knifyspoony.I had this problem too. It took about 4 months until the battery was completely replaced. Plus about 6 visits to the dealer over several days. The duration was due to the fact that a) the dealer needed a special crane for the workshop, the battery weighs approx. 500 kg and b) the replacement battery had to come from Kore by ship. Flying is not!
After replacing the battery, another workshop visit was due because another part had to be replaced.
Now everything seems to be OK. Current range at 90% 420km. I'm happy with that.
I am still satisfied with my dealer. Hyundai well, on my complaint that I could not use the car as intended for over 3 months, no trips over 100 km due to insufficient range and practically no charging power. Fall from approx. 20 kW to less than 5 kW after approx. 10 minutes. And that at a 50 kW station. Charging was only possible on 22kW columns with charging power below 5 kW! I am still waiting for an answer or compensation after another 3 months.