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Hyundai Ioniq 38kW EV
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Hi all.

I read that the above appears to be a common issue with the Kona and Ioniq, whereby the 12V battery discharges (resulting in a flat battery). T

Couple of queries:

a) Does the HV battery trickle charge the 12V battery (similar to what happens in the 40kW LEAF)?
b) Does turning off the aux battery saving have any affect?
c) Several (?) people have mentioned about water ingest in doors causing a short circuit. Is this a systematic quality issue with both models (if so, surely a recall is required?)
d) Others have mentioned that it is down to the quality of the 12V battery used.

I am assuming that if you are constantly using the car, then the probability of having a completely discharged 12V battery is greatly reduced?

Thoughts?

Kieren
 

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Ioniq 38kWh
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As far as I can tell from my dash plug in voltmeter a) is a yes, but only when the car is switched on or in Aux mode (I've never used that btw). b) there is a thread somewhere showing that aux saver uses more power when on all the time but I don't think it's significant as the amounts are trivial. (I've never seen any evidence mine has ever worked although the dealer tells me mine is working). When the chips are down and a fault occurs, my opinion is that the battery saver is next to useless. My 12 volt failed 5 times before they found the passenger doors' switches (both of them) at fault. c) I was the person who has had the water in door switches issue and I would agree that should be a recall to check the waterproofing. In my case they wouldn't look at the drivers side doors as there was no error recorded for that side which is the only complaint against my dealer so far.
I would think d) is a probable no if 'error drains' are eliminated. I don't think it should be necessary to carry around a portable booster pack on a £30K new car. I had a BM2 monitor connected for 3 days (before it died - I have another on order), and in that 3 days the battery voltage hardly changed at all (overnight, i.e. when the car wasn't being driven). So the inherent drain overnight was negligible. Regarding your last comment, I think the problems are faults rather than inherent frailties regarding battery capacity etc, so it shouldn't much matter (unless you left the car unused for months). cheers
 

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Kona 2020
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Hi! New member here. On my Kona there is a small light on the front emblem that switch on when the 12volt battery is charging. I`ve seen it a couple of times when the car is parked, ignition off.
 

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I think Ioniq also does this. Occasionally these EVs wake up, and check the 12's happy, and give it a charge if not. Dunno how often this happens, I suspect there's been a recent upgrade to make it more often. Maybe once every couple of days, maybe twice a day, whatever.
 
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