IONIQ 5’s 12-volt battery is dead: here's how I jump-started it 

I’m one step ahead of you Andrew. I’ve got my jump starter stored in the frunk! Haven’t need it so far!🤞

I had 3 batteries on my e-Niro on 112 000 km as a taxi. They were replaced free of charge. No problems on my Ioniq 5 RWD. Keep the charger in the frunk.

It really is amazing the Hyundai and Kia have not learnt from the Kona and Niro 12V disaster, especially since the Kona received and updated software to fix the issue. You would think they would have implemented a similar programming to the Ioniq 5. Also, this is why I leave my booster pack in the glove box.

Thanks so much. We were stuck in an underground car park in Belgium with no other option than calling for recovery until we found this video! ❤️❤️❤️ Your advice saved us!

Your videos are an education. As soon as I get my Ioniq 5 back (no idea how long that's going to be) I will be making use of your tips and tricks. Thanks.

I keep a Battery Tender 12v charger in my garage and hook it up to the 12v terminals on my vehicle once a month or so and let it trickle charge overnight. So far, my 2018 Honda Clarity has had no 12v issues with the tiny OEM battery that Honda installed at the factory. I agree, the 12v jump pack is a must have for any owner. Simple jumper cables won't help you if your car is parked in a tight spot where a second vehicle can't pull alongside to provide a jump start.

You can buy a battery starter similar to the one I'm using here. I've not tested these though! Amazon UK: amzn.to/3tLIuo0 Amazon USA: amzn.to/3LakBNO And the battery monitor (which I'll show in a video soon) is here... Amazon UK: amzn.to/32XzTnT Amazon USA: amzn.to/3onhiJo (These are referral links - even if you buy another product from Amazon instead, you'll still be supporting the channel. THANK YOU!)

Thank you so much for this video Andrew. I thought it possible I might have to do this sometime and your demo was as clear as a bell, I even have the same back up charger (having bought it for my previous Prius which gave me this problem a couple of times). I agree this is a ridiculous problem which they should have sorted out ages ago given the history on previous models.

Thank you so much for this! Got my Ioniq back up and running with your help. Lifesaver!

Thanks Andrew for another refreshingly honest video. Totally agree how in this day and age where the technology you are driving is so accomplished are we still dependent on elderly lead cell 12 volt batteries to power ups he internal technology? Come on manufacturers get this sorted across the board.

Has happened 3 times now in our new Kia Soul. Same as yourself: after a longer journey or after at least >100 combined miles. Many thanks for your previous videos about the e Nero 12 v issue; they saved us a lot of stress. We are hoping Kia will replace the 12v battery…..

Thanks, Andrew. Ordered a jump starter as soon as I had watched this yesterday, which is now charging in readiness . . . Back in October, I asked my Hyundai dealer to charge the 12v battery as part of the PDI, as I had read of problems with the batteries discharging during transit. I was grandly told by the service manager that they couldn't, because the Ioniq 5 didn't have a 12v battery! When I sent them the relevant page from the owner manual, they then sent me an email telling me how to access the 12v battery - which I had just told them. Messaged them a week ago to ask for a firmware update; received an auto-response but nothing since, despite e-mailing a reminder. This is my first Hyundai and my first EV. On the basis of the dealer experience so far, it might well be my last Hyundai, but I like the EV driving, so thanks for your various informative videos, which encouraged me to take the plunge.

One idea is to get a deep cycle 12V marine battery rather than the "starting" batteries that all new EVs seem to come with. You don't need the high amperage kick that ICE vehicles need from a 12V starting battery. But what EVs do need is the deep cycle storage that marine batteries have. I replaced the starting battery in my Nissan Leaf with a deep cycle marine battery, and it has been golden.

Sorry to hear you're starting a new 12v saga. Your previous series has me wondering about my Niro EV. Hope it doesn't turn into a multi-month challenge. On an upbeat note, I love the videos with you and your wife. They're informative whilst being pure comedy. Thank you for the great content! ☺️🍻

Thanks! This helps! We just got our car 2 days ago and I saw this warning. I just bought it from your link just in case. Have a great day!

Funny i just rewatched your last 12volt video. My IoniQ 38kwh was warning me this week that it was low before completely going flat yesterday. I jump started it plugged it in at work all is fine now! Booked it in but have a 2 week wait! I have put a battery monitor on like your Niro. Thankyou very much for this great info.

Great job Andrew !👍

Thankful to have found your videos. I just bought an ionic 5 and was wondering what to do if this happened. Cheers

Thanks for the link on what to buy, I've ordered it!

Had this exact issue on mine, but realised after that I had stupidly sat in shopping park, waiting for the boss, with the radio on and my dash cam without being in ready or utility mode. I got a traditional jump start from a neighbour and now keep jump leads in the frunk, but after typing this will be clicking on your link to grab a battery... thank you :-)

After reading loads and loads of rambling forum threads and a bucket full of videos none of which really helped I found your video. Wonderful, and thank you so much for sharing a simple, straightforward solution. Cheers, Simon

I have a battery in my Mitsubishi Colt Ralliart and it’s original from 2008! I cannot believe that it still works in the Swedish winter. Btw, my Ioniq 5 should arrive in march! So exited! 😁

I had the same issue with a 2022 Toyota RAV4 PHEV. Drove 200 miles and parked up on holiday for a week and didn’t use the car. When I went to load our cases the 12v battery was completely flat. Couldn’t open the boot or doors electronically. Had to use the emergency procedure to get in the car and then use jump leads to put the car in ready mode. Took it Toyota who kept it overnight but said the battery was ok, and advised that it was ‘normal’ for electric cars! I went straight to Halfords to buy a battery pack like yours which fits in the glove box (don’t keep it in the boot!). A couple of months later when we took the car in for a service we were told it needed a software update to tackle a 12v battery problem- surprise surprise:). Haven’t had the issue since but having the battery box in the glovebox sure is reassuring.

My wife's 66 reg Kia EV Soul has been having 12V battery issues, found it dead a few times over recent months, even had to jump start it from my diesel once. Bought the battery jumper you recommended, used it for the first time today, and it worked a treat👍

Thank you so much for posting this video, I used this to jump start my ioniq 5,

Always enjoy your informative videos. Puzzled by the comment on recommended jump starter "Please do not start vehicles when there is less than 50% of electricity left" Maybe its lost in translation. For what its worth, I have an E niro and no problems at all (20 months)but should be collecting Ioniq 5 in April and know several people who have had battery issues.

Very useful info as I have ordered the Ioniq5 but the wait time is long in Canada but the good thing they confirmed yesterday I will be getting a 2023 which means with all the updated .

ThAnk You👍🏼 Worked like a charm. So relieving that it wasnt as hard as on my previous gas car. Brilliant.

Hiya Andrew, I had a test drive in the Ioniq5 yesterday, was just about to go out and put my deposit on an ultimate RWD now I'm not so sure.Keep up the good work I think that you are one of the most honest helpful and informative person on RU-vid,your videos are excellent.

Not just a Hyundai/Kia issue. The Polestar 2 has this same problem according to the many posts on the Polestar forum. I just can't wrap my head around why it's so difficult for these manufacturers to get the BMS to recharge the 12V

Oh no! That's a real Victor Meldrew moment isn't it?! Andrew I can't thank you enough for being one of those people to whom **it always happens...! We are also of that persuasion and its so good to see how you deal with these things... including learning that perhaps the glove box is a better place to store the jump starter. 😂 Especially as we're neither of us as young slim and limber as yourself. Still another 18 months or so before we can make the change but I'm kind of leaning towards a secondhand Ioniq Premium 28kW as the best car for us, boot could be a problem but overall the pros outweigh that con. Good luck with the 12v, let it not be saga eh?!

Ordered the jump starter from your link. Have a BMW i3 and many owners have also had 12V issues. Good idea to have this at the ready.

Thank you so much, this just happened to us and we had no idea what to do until we saw your very helpful and easy to follow video....what a legend you are! The car is charging as I type.

Looking in from the outside this is almost a rite of passage for every EV i.e. the 12V battery causing issues. Thanks for keeping us informed.

I think this is the typical Ioniq 5 problem I have seen many times on RU-vid. Because of the charging port cover is closing to hard, the closing button is permanently pressed, which is causing a trigger loop in the software logic. So the battery gets down after some hours. So, this is a known issue, ask your Hyundai dealer. Some owners fixed this problem by fastening some pads between the charging port and the cover to prevent that the closing button is pressed by the cover.

I have deployed homeassistant and used the Kia and Hyundai plug in. Gives me lovely live(ish) and historic data of the 12v and much more.

I’ve had this happen twice in 2 years with our e-Niro. As others have pointed out this is almost certainly a software fault as all batteries go flat it not being charged. The second time I bought a fancy jump start battery but it failed to fix the issue as its logic required some voltage to sense it was corrected correctly. The recovery man brought something similar which failed too - but his had an override button that fixed the issue. I was going again in only a minute or two. I so wish I’d noted the model of jump starter.

My new KIA EV6 has the same problem. I had the problem once with my E-Niro got no start but a swarm of false alarms. My dealer recommended that I charge the 12 volt battery often with a traditional charger during the winter. He said that the system goes crazy when the voltage goes too low (11 volt he guessed). He also said that every time you open a door or punch in with the app the car wakes up the 12 volt system for 30-40 minutes. That seems to deplete the battery without waking the "charge me" signal. Good luck!

Thanks for showing us what to do. I have already bought a 12V battery jump starter, but I'd buried it for safe keeping right at the bottom of my e-Niro's boot. Having seen you have to go over the back to get it I realised I would have had real problems getting it out of the boot in an emergency🤔 Have now put it in a bag just floating around at the back of the car.

Unbelievable how this is an issue on EV's. Thanks for this video. It brings awareness to the issue. Why couldn't they have a built-in battery monitor that would alert you that the battery is critically low? Even better have a module that automatically comes on to top up the 12V from the high voltage/bigger battery. The smartest minds at Tesla couldn't fix this? sheeesh.

Good advice, will put my order in for a jump starter, have an i3 so have been lucky

I'm really surprised to hear there are 12v battery issues with the current car of EVs. My 2017 e-Golf has an AGM battery and has never given me any issues. The car will turn off the radio if the level starts to get low, but putting the car in Ready mode starts the recharging process. Thanks for the video.

Hi got one in my old mgev now its in my e niro just incase lol cheers keep up the good work

I had exactly same problem with my KIA e soul, had RAC come out and apply power to the existing battery to start the car, the chap then changed the battery for a better model. Like you I also bought a jumper.

We've had 12V issues with our 22kwh Zoe - never been completely flat, but eventually traced weird intermittent electrical issues to a low ish 12v battery. Replaced it myself and problems went away. Think I worked out there was a time I was sitting in it reading a book while waiting for a rapid charge - kept opening the door to keep interior light on when the car went to sleep. I realise now this caused a big drain on the 12V battery which probably wasn't getting charged even though the car was plugged in and charging.🤦‍♂️

Hi Andrew my Ioniq5 12v woes continue. Hyundai Assist(AA) out four times in two days! They confirmed the 12v was goosed and not accepting a charge. My dealer would not accept the AA findings and said to book my car in…..six weeks until the earliest slot. I have just simply replaced the duff battery for a new one. What is interesting the last AA patrol guy told me he was part of a team called in to help do PDI checks at Tilbury docks as Hyundai themselves could not cope with the work. He said the amount of replacement parts including main batteries was astonishing. As I mentioned before a great video. Keep on posting. You and your family keep safe.

Omg thanks for heads up. I have Ioniq 5

Great video. Tnx for your info

A LIFE SAVER VIDEO! There is a recall currently for this very problem with the 2023 IONIG 5. I will buy one to avoid a tow, then drive it to the dealer where the Safety Recall notice says the issue is the ICCU which charges the vehicle's 12-volt battery. My car is dead, currently. The actual fix says, the "time required to perform the software update on your vehicle will take less than one hour..."

3 years and 32,000 miles of owning my Kona without 12v battery issues. I've enabled the 12v battery saver option and occasionally see the yellow light on the H logo in the front illuminated to indicate the car is topping up the 12v battery. Lucky I guess.

I had the 12v battery fail on our Soul. My jump start pack (which was identical to yours) wasn't powerful enough to hold the relay closed for the main battery to take over. In my case the battery had dropped to about 9v. Maybe if the 12v battery is low enough it sucks all the power from the jump start pack preventing the 12v system rising high enough for the 400v battery to take over. In the end I managed to get the system back to normal by using a 12v battery charger for 30 minutes. I now carry a battery charger as well as the jump start unit. I provided Kia with the graph off the voltage monitor app which they appreciated but even having had the car for a week they couldn't find the problem. The car has run since for 6 weeks without a problem but like you I don't trust it not to fail again.

Great video for a bad problem. Waiting for ever for my Ioniq5 but bought one of these from your Amazon referral. Thanks.

I've been anticipating this issue with my modest vauxhall Corsa,after seeing your problems,but no issues so far.

Good job you don’t swear Andrew!

Thanks Andrew. Would you recommend updating to a better quality 12v battery? I pick mine up in a week.

Andrew, we get our I5 next week on the 1st March - lucky us - so I've just ordered both the gadgets so we can keep on eye on the 12V and jump the car if needed. Thanks for the tip.

Thanks for this video and sorry to see you continue to have problems with sub standard 12V lead acid batteries and poor battery management software in the Kia eNiro and now the Hyundai Ioniq 5. Hope Kia & Hyundai sort this out soon. One thing you mentioned is to press the brake pedal before pressing the Start button to put it in Ready mode so that the electronics don’t drain the 12V battery. Is this the same as the Utility mode? What’s the difference between the two? I searched Lia documentation but can’t find an explanation.

Great video, I googled the reason EV car still uses 12v battery, lead acid battery to boot. There are actually some very legit reasons. One of the major reason is so your main lithium ion battery will not brick and costing you $20k-$40k to replace. Sorry you have to endure 12v battery a little longer until engineers figure out a good cheap solution for this. Meanwhile, I'm going to get that battery jump starter you recommended. Looks very handy even for ICE cars.

Same issue with my ioniq 5, was off the road for over 6 weeks waiting on parts from Korea. Was told that it was faulty charge door actuator and on board charger

I had the same problem with my wife's EV6 having it for just 2 days, now I also bought a small battery charger that is in the armrest storage.

The jump pack is great, lesson is keep it in the glove box. Shocked the 12 Volt i snot topped up by the main battery charger, pretty poor oversight. Good thing you are well prepared.

I have had the same problem with my Ford Fusion hybrid, which uses the 12v battery to run the computer and contactors for the high voltage battery. I have a similar device for the occasional emergencies. Sorry to hear that this happens with the P45 but not surprised.

Very useful video sir. Thank you for sharing. I will be ready when I acquire an EV.

I just had this problem with my Niro, garage says everything is OK, which it obviously isn't! Thanks for this video, I've just ordered the jump starter 😃

Watching with interest as I'm about to order an Ioniq 5 very soon, I will get my backup jumper too! At 2:29 you can see the battery rating plate - Hyundai are definitely fitting ICE starter batteries to their EVs, as your battery has a CCA (cold cranking amps) rating of 550A, which is all about the current surge it can supply to crank a starter motor. Totally unneccesary for an EV. The batttery should be a deep-cycle type, which will provide a steady current output for much longer than a starter motor of equal Ah capacity, or even better a Li-Ion type with greater capacity and less weight. But even so, there is clear a system design issue here. The 12V battery shouldn't be getting allowed to go flat at all, since charging of the main battery seems to depend on it. Would be interesting to see how Hyundai/KIA have modelled the partitioning between the high voltage drive system and the low voltage electrical system, 'cos they are definitely missing something.

I had that with my classic Ioniq PHEV. The sensor in the trunk hatch was stuck and left the light on in the trunk. I quickly recognized that, because I had something similar with an Audi long time ago and the analysis cost me two weeks in the garage back in the days. I uncluttered the lock sensor and everything was fine except it did not charge, because - like here - the electronics runs on 12V. So I charged the battery for 15 minutes and then plugged the car into the charger, afterwards the drive battery charged up the 12V and everything was fine ... however 2 years later it turns out that the 12V was actually damaged by deeply draining it.

Another great video from this channel. As I don’t own an EV I had no idea about the 12 volt battery nightmare. I’m so conflicted about EVs with their pros and cons. Watching you have to climb through to the boot and yank plastic covers off from under the bonnet doesn’t help, yet this honest and gritty delivery technique helps me process and prepare what I might be up for. How does battery management compare across brands? Can I assume Tesla owners don’t have the same problem as Hyundai owners or is this misguided? Thanks for sharing your lived experience - keep it up.

Due to get an ioniq 5 in April and now I’m dreading it! I work away a lot and I hope this doesn’t happen 😬 thanks for the video.

thanks, man, you really saved me 🙏

Most people in Norway (and here in Sweden) that had this happen reported that they had used Bluelink to open charge port. Somehow motor keeps drawing power then. So weird!

Hi, I've posted about this several times on Speak EV. My Ioniq38 had a similar issue and was in the dealer 4 times with dead 12v, I was about to trade it in as I was so fed up with it. However, in the nick of time, the 4th time this happened, by a fluke I noticed that one front door was locked and the was unlocked (this may have been the case on the earlier occasions but was not noticed). This gave an error code to the dealer saying there was an issue with one door lock. What was happening was water ingress into the front doors past the glass as normal was impinging on non waterproofed electrics (the mechanic said he had never seen that before on any car usually there is at least a plastic shield to protect the electrics). The car thought the door was open due to the water droplet(s) bridging the contacts and kept the car awake. I was getting lots of "you have left the doors unlocked messages" through bluelink which I had dismissed as nonsense since I could see the mirrors were folded in...... So the dealer waterproofed the door electrics and I haven't had a problem since. If this happens after rain or washing your car then look out! One time the AA came and were actually measuring a 2A vampire drain but couldn't say or didn't have the time to diagnose where it was coming from, they said the dealer will have to diagnose that. So, one close of the door, the droplet falls away and hey presto the evidence is gone! No idea why the error code didn't flag the other 3 times... "Friday afternoon manufacturing error" or not I can't say, as I know lots of people have similar issues but have said that at the time it happened to them it was dry.

We cut the power at all MV accidents. Now I know where it is.. thanks.

My Nissan LEAF was 9 years old before I changed the 12v battery. It was still working fine, but I would notice the right blue dash light flashing more often, which was the car topping it up.

Keyfob battery issues (both of our EV, over 7 years) we have encountered, one recovery because circumstances conspired to leave me & my unstable Mum stranded in our 24kWh Nissan Leaf, but not failure of the 12V battery. Next time (if ever) we have a spontaneous failure of control systems, you've given me an idea of what might have gone wrong. Unconcerned about one car having no alternator, so thanks for tailoring your video to the range anxious followers still driving fossil fuel beasts.

I should have added in my comment a thanks for showing how to remove the cover over the battery. I cannot find this in the owner's manual. They talk a lot about charging the battery and removing connections but not access to the battery.

I bought a 12V USB charger socket which also has a readout of the battery voltage. It's usually showing around 14.8V when I check it.

Quite recently I came across the same story from an American guy with that model of Hyundai. Unfortunately that firm is not the only one with faults like that. Years ago, I (and thousands of others) had similar issues with the old Honda Civic Ctdi model, in which occasionally the 12v 70 Ah battery would discharge overnight, thus being unable to start the engine. It was caused by a software fault in a Bosch product, and as my car was under warranty it was repaired by the dealer with no specific charge. The method was to upgrade the firmware supplied by Bosch for the component that caused it. Like many modern cars, it used the Controller Area Network (CAN bus); ironically invented by Bosch, which is a complex system designed to use a two core cable for everything rather than a multi core, or lots of cables to perform a variety of functions. When the fault occurred, something did not switch off properly, and continued to draw current from the 12V battery. I happen to know some of the detail about that fault, as I know one of the (ex) workers at the Honda factory, who had to deal with it. No doubt they claimed back from Bosch (their supplier) after picking up the costs of fixing the fault with their customers, like me. Like yourself, I carry a similar jump start product. At present, I run a Toyota hybrid, which only uses the 12V battery (which is a small one under it’s back seat, and awkward to access) for 12V circuits when the power is off - the rest of the time it uses a dc - dc converter when the traction battery is live. It is not even used to start the engine - that is done using the high voltage dc via it’s triple inverters (for the 3 phase ac motor generator), there being no conventional dc starter motor.

Mate, I could almost dive into my computer screen and give you a big hug! I have a BYD Atto 3 here in Western Australia and have heard that there problems with the 12V lead acid battery used by BYD. This problem however is not limited to BYD as I've heard that Tesla, MG and now from your video, KIA have this problem too. Your video is absolutely invaluable to me. I'm just going on eBay and have found a Baseus unit which offers 3 different output currents so I'll just select the cheaper 8000 mAH version rather that the 20000 mAH version. Do you think that replacing the LA battery to a Lithium unit would be the answer to all of this? THANK YOU THANK YOU THANK YOU!!!!!

Your correct, it’s crazy , Honda E had same problem

First time I hear of this. Had a Kia Soul for 3 years, no issues even when it sat for 3 months. On the I5 I see the amber light come on showing it's charging the 12v while stationary. I never park the car overnight with less than 50% charge.

I have a Rav4 Prime and have had the same problem with it. The car did start, but ran as a pure ICE car (no battery use at all) until the 12V was charged enough to allow the hybrid/EV operation to start again. The dealer said I had to turn it on once a day or buy a trickle charger. I agree entirely with your sentiments that it is mind boggling that you can have a car with a multi kWh battery and it can't keep a puny 12V battery charged. I assumed an BEV would be a big more sophisticated than my PHEV, but you know what they say when you 'assume' something.

Hi Andrew I have a 40kwh leaf I noticed the other month when my car was off and parked up not connected to the mains that it suddenly had a blue light flashing on the dash. It appears that the 12 volt battery is monitored and the main battery will keep it topped up if it gets too low in voltage. I think the first leaf used to have a little solar panel to keep the 12 volt topped up also but they have done away with these.

Thanks for the video. I'm slightly less worried that my Ioniq 5 isn't totally dead now and the recovery guy will get me going again!

How did you open the charge door? Others have discovered the opening of the door via the app ends up draining the 12v battery. I thought you also had a bm2 battery monitor? It should give you an idea if it died after opening the charge door. We have not had the 12v issue (yet) but carry a booster in the frunk for that reason, I'm sure you'll be keeping yours there going forward.

There always seems to be these 12v issues with newly released EVs. The ID.3 was the same although they’ve fixed that with an update now - I still have a BT 12v monitor attached to mine just in case though.

I had this exact problem on day 1 and day 2 when I just got my Ioniq 5. The 12V battery measured 3 volts. I should have known about the utility mode, the old fashioned mechanic with the jumpstarter said that I should have a drive for half an hour. I think that the battery management system for the 12V battery is not turned on often enough. It should turn on periodically to charge the 12V, because the 12V is also used to update the remote control systems via the Bluelink app. My Bluelink app didn't tell me anything about the 12V battery when it happened to me. The dealership measured the 12V battery a few days later, they said that everything was fine. I actually never had this problem again afterwards.

Gratefully it seems the 500e will top up the aux battery when charging the main battery and also divert some of the regen too, fingers crossed no battery issues

EV6 has the same issue. Theories include boot not shutting properly so the car stays awake. But you'd think the app would warn that it thought the boot wasn't shut so the owner could shut it or tell the app 'yes it's shut, stop fussing'

I had a fully charged Kia Soul EV, and the 12v battery was dead. RAC man said a cell had gone, but KIA said it was fine-we shall see. Invested in jump start device like the one you use Andrew and the device you recommended to monitor battery condition. This failure was the first time in 50 years my car would not start! And they call it progress.

Thanks Andrew same issue with my Kona and the e Niro. My car was fine until the ECU was reflashed with update.

Nissan Leafs were supposed to have this problem and many folks experienced it but my leaf is over 6 years old now and I've (so far) never had a problem. I did get the version with the solar spoiler which trickle charges the 12v so I do wonder if that has helped. I have no idea if that is still working though it gets pretty grubby!! Think I better get ones of those jump starters just in case anyway they don't cost much now. Thanks for the reminder!

Thanks for the information as I thought that the 12v would have been automatically charged or topped up once it got to a certain point while the car was charging. Unless the car we intend to buy next year has a 12v lithium battery as standard I'm afraid it'll be the first thing I'll be changing when we get it. I know it probably seems daft of me to do this to a new car but I would have thought they'd be a standard feature as you're been powered by lithium anyway and just for the convenience of fully charging it in a couple of hours instead of overnight.

Had the same issue with my Ioniq 38 kWh, bought the cheapest jumpstarter from Halfords, and it works fine. I keep it in the side slot in the boot which is easy to reach via the back seat. I don't think you need utility mode just connect the jumper and start the car and off you go. However this does need fixing a nearly new car should start first time every time. 😠

It’s incredible it’s happening so quickly. Maybe you should talk with the RU-vidr EVolution. He changed the 12v battery of his e-Niro for a better one with low power discharge (or something like that) and you could ask him if it solved the problem

well said sir...

I have the Kona , had the same problem twice now, took it back to the dealer "Nothing wrong mate". So anyway I now keep the backup battery under the front seat now, but it shouldn't be necessary at all. Clearly there is a design/ software issue as there was now warning via the app.

Now it's done it once it will happen again I'm afraid as the 12v battery has been compromised, but you knew that already. Have to say my 2020 Soul in 1 year of ownership has never had any issues. Mainly it only gets driven on the weekends. I have one of them starter chargers in a door pocket ready for the day, but so far it's been used to keep my wife's phone charged and therefore connected to Facebook.. Also i use the Zappi scheduler to charge my car, never had much luck with my Leaf's built in charge timer and the Kia is just as complicated. Good luck, I'll be waiting for the video on Monday where the 12v failed again....

Good information thank you. I have not had a problem with my 3s 12 volt battery. It is now about 4 years old. This is about when the original 12 volt would fail on a ICE car. I wonder if it is covered under the Tesla 8 year 130000 mile drivetrain warranty.

It would appear that there is constant drain on the battery, a defective charging circuit, or a defective battery. I would have the dealer check all these items. I would have them replace the battery if they don’t find anything specific. One trip to the dealer needs to resolve the problem for you. Hope to see your findings is the next series of videos. Maybe “12v Battery Saga Continues…” Can’t wait till the next episode. Hopefully your wife is included. ✅

This happened to classic Ioniq's as well but thought they fixed it with the Aux Battery saver option which my car has on by default and works all the time never had any issue with 12v on my classic Ioniq 2019 model. Is there some setting to keep the 12v aux battery charged off the main battery? Odd they didn't sort it from Kona/Ioniq issue with new Ioniq 5 but one reason I try to avoid being first to get a new model, like to wait a year or two for all the bugs to come out and get fixed prior to considering one, no matter which car it is.