[Swwils]

A smart sensor on the 12V battery's negative terminal is a potential suspect and requires inspection. Furthermore, a review of the vehicle's records for the past 30 days should identify instances of parasitic drain while stationary. Any current draw exceeding 50 mA is unacceptable and necessitates diagnostic testing to pinpoint the source of the 12V battery drain when the vehicle is not running.

This is not the standard parasitic draw test and would not provide any actionable information.

 

[Swwils]

There are numerous discussions about which replacement 12v battery to use here and on the KIA EV6 forum (search box at the top of every page). The overall consensus is that a quality AGM battery is best.

Although some are using them (apparently successfully so far) LFP batteries are not recommended for E-GMP vehicles like our EV6 according to an HMG engineer:

https://www.kiaevforums.com/threads/12-volt-battery-problems.10043/?post_id=133047#post-133047

As mentioned, a good quality AGM Group 47 H5 12v battery is recommended due to its ability to better handle deep discharge and recharge cycles that our vehicles demand. Common size and easy DIY install.

This thread has more info as well:

https://www.kiaevforums.com/threads/ohmmu-sodium-12v-battery-available-for-100-less-than-lfp-with-similar-benefits.13747/

Your call of course and hope that helps!

It's unlikely he is an engineer and you should exercise caution with his seemingly AI slop.

 

[Swwils]

After reading what seems like hundreds of posts of dead 12V batteries in relatively new cars, I can't help but feel that there is something fundamentally wrong with the Kia power management architecture (hardware or more likely software) relative to the 12V battery.

Blame is repeatedly placed on the battery and/or things like the electric company pinging the car. I say there is no excuse for this, when there's a giant energy source in the form of a HV battery just sitting there, and no shortage of computing power, sensors and monitors.

The car's software and power management hardware should be able to keep the 12V battery properly charged, and if necessary prevent frequent pings that draw excess power - or at least issue a warning long before things have gotten so bad that the car can't be started.

Kia has created an architecture which seems very fragile when it comes to charging and maintaining it's 12V battery.

It's not fragile it's just abit weird. At first release they had some legit drain issues with UWB waking that were fixed last year.

The car does wake up to recharge the 12V battery from the HV battery when the 12V SOC gets below 80%. In practice, this has issues; it's power-intensive to recharge, because the car needs to wake up and supply about 200W worth of modules for 20min or an hour when all it wants to do is charge the 12v.

There is also a naive logic. The car doesn't want to over-charge a faulty 12V battery that might be dead anyway, thereby over-discharging the main battery. It solves this problem rather stupidly by understanding implementing a counter "If I have to wake up a 10th time to recharge the 12V battery, something's wrong, i'll assume it's faulty, and I will stop doing that until it's replaced."

All well and good if there IS an internal fault in the battery, but quickly leads to problems if the battery is draining because the car is just awake a lot and there are a bunch of legitimate draws on it. Since it will stop changing a good battery, damaging it.

It's also linked to drive mode, ABS comes back to life if the battery shows that it held a voltage for 2 continuous test cycles (basically 30 min) and if it did the ABS will reset counters and start from 0 again. So if you do alot of short trips you previously were vulnerable too.

 

[Swwils]

@EV- Technician is in fact an HMG engineer.

Cool we have had no such evidence and when called out we have seen much less perplexity ai slop posted here.