My 12 volt battery on my 2020 Kona ev 9000 miles on the clock had gone flat 4 times,first time was my fault but other 3 times went flat for no reason.Called the AA all they did was charge for a few minutes and the car started.
When i took it to the main agent they just shugged their shoulders as to why it had gone flat and said to replace the battery making a big point that 12 volt batteries only have a 2 year warranty.
Cost of £126 so lets see if this fixes the fault?

 

Need to load test the battery. Two years old don't mean it will do the job.

 

It load tested at 470 amps, higher than it’s rated for.

 

this is also a problem with the ioniq cars. there is some evidence that there is a draw on the battery, like a dashcam in parking mode. some say if your phone is close enough to the car, it will keep draining the battery. even alarm systems, or something connected to the obd port. i have a battery minder, and i can check the battery, which i do a lot. they are cheap, and then you can be alerted when the battery needs to be charged. they also will keep a log of the voltages, so you can see when stuff happens

 

I've had the same problem with mine. Looking in the manual (and threads elsewhere), there was an option called aux battery saver+ which charges the battery when necessary from the EV battery. When this happens the little light in the Hyundai symbol on the front of the car turns on. I don't have the option available, possibly since a software upgrade? The feature is not working, I have now had a flat battery 5 times. Invested in a little emergency battery pack which has saved the day several times now. Battery tested today and was fine. Charger connected now.

 

we have an ioniq 5. lots of posts about battery failure. we have a battery minder, and i check it several times a day. it shows when it is charging, voltage, and more. most of the time, when it is in charge mode, the charge time is very short. and, most of the time, when in charge mode, the orange lite is NOT illuminated. we also do NOT use bluelink, or any other app that can talk to the car.

 

Thanks. I believe my car is set to charge as needed. Interestingly, the dealer has finally looked at my car and said everything checks out and the problem is the battery. Time will tell I guess.

 

There is also a similar problem with Kia EV6 cars.