Trying to decode the 12V Battery in the 2022-2025 Lexus NX
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- Опубликовано: 20 июл 2024
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This video talks about the 12V battery and how we are trying to decode the 12V mystery on why so many people are getting dead batteries. We install a battery monitor to see what does the car do while in operations. This gives us a good understanding on situations the car will charge and the car will not charge the 12V battery. ⚡🚗 #LexusNX #BatteryObservations #AutomotiveInsights
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00:00:00 - Introduction / Production Installation
00:04:00 - Mobile App Setup
00:05:16 - Verifying the State of Charge
00:09:22 - Driving the vehicle
00:14:37 - Not always the case where it will charge
00:18:29 - Longer drives?
00:20:14 - Car Idling
00:22:03 - Car Idling for 1 hour
00:27:01 - Leaving the charger plugged in
00:29:00 - Level 1 Charging
00:31:15 - Level 2 Charging
00:35:57 - Mobile App Usage
00:38:40 - Final Thoughts 
Авто/Мото
I own a NX350h 2024. After watching this video last week, I bought the Ancel BM200 and Noco battery charger. I ran some tests over the past few days. Before the testing, I reconfigured some of the car's features which consume battery current when the car is off (not ready) but I am in or near the car. This included: 1) turning off the seat reposition, 2) turning off exterior lights to 0-sec, 3) turning off head lights to 0-sec. So the only active current drain is the interior ceiling lamps, door sensor, key fob sensor. My observation is:
1) the current drain (SOC) while in a dormant mode with Ready Off is -1% drain per minute. So after 10 minutes in the car dormant, the BM200 showed the SOC dropped from 100% to 90%.
2) when the car is left alone overnight, the SOC fell -1% over 12 hours, or -2% SOC decline per day.
3) while the BM200 has very low current drain when the driver (and his phone app) is far away. I found that if I stood outside of the locked car, but ran the BM200 app, the app would show the voltage gradually dropping. Such as from 12.60, to 12.59 to 12.58 over a couple of minutes. I suspect its not the App which is poling the device that is causing the increased drain, rather it is probably the car that is actively poling with the key fob.
My conclusion is that the 12-volt battery can be expected to loose SOC of about 10% to 15% per week, if the car is left unused.
As noted by other drivers, the NX should be started immediately upon entering the vehicle (within half minute). And, the car should be kept in Ready ON if the driver intends to sit for an extended period in the stationary car. And, it is advisable to reduce the headlights timer to 0-sec. And, ensure the key fob is out of range of the car, when the fob is in your house, and the car is in the adjoining garage.
Thanks for checking out the 350h. Did you notice the same behavior with the voltage while driving? Does it charge the 12V in drive? In park it will charge at 13-14V?
@@lsft
Yes, the car does properly charge the depleted 12V battery when the car is in Ready ON mode. This was running at 14.2V initially for few minutes, then falling by holding at 13.6V. Note, this test was with the car parked the whole time, but in Ready ON mode. I have not yet driven the car in testing the charge voltage states.
My 12V battery was initially deeply discharged at 10% SOC. This is because I was using the car's auxillary features (cabin light, etc) when the car was in Ready OFF mode for an extended period of time. I did this before LEARNING FROM YOUR VIDEOS on this subject.
Peak charging voltage jumped to 14.2V but held there only for a few minutes.
Sustained charging voltage held at 13.6V and continued for few hours while the low SOC was recharged.
When the battery was fully charged at 100% SOC, and NOCO was disconnected, the 12V battery gradually fell to a nominal 12.6V within 5 or 10 minutes.
I tested the BM200 voltage reading against a professional multimeter. The BM200 was low by only 0.02V - this is excellent accuracy for the BM200. Like you, I also installed a USB charger in the driver's cubby cigarette lighter; that device also included a voltmeter readout; its error was high by 0.08V.
By the way, I installed my Noco Genius5 directly inside the car's battery cellar (just beside the 12V volt). Noco provides a bracket that allows the charger to be adhesively attached to the car cellar wall. The extra length of cables could be neatly bundled and also stowed there. Then, the wall plug of the Noco can be partially pulled out the battery cellar. I have added a two-wire 120V extension cord which allows the reaching of a building wall receptacle. The car's tail gate can be safely closed upon the 120V extension cord, proven by the sliding of the cord when the door is closed; the trick is to use the thinner 2-wire extension cord, and not a thicker 3-wire type.
@@lsft I am an engineer and understand electronics etc. However, the NX350h - this hybrid - sorely fooled me (made a fool of me) in thinking that I could use the car's 12V in auxillary mode (Ready OFF) for sustained periods (10 or 20 mins). My previous car was a Lexus CT200h 2016 - which never gave me any battery issues or concerns. Only after watching your videos on this subject did I check my car's battery state - to my astonishment. (So, thanks for enlightening your fellow hybrid drivers).
The best precaution I have taken from your video was BUY and INSTALL the ANCEL BM200 battery monitor. Note, a cigarette adapter voltmeter (which you and I have also) is not very meaningful, as it won't reveal the SOC state of the battery when the car is off, Ready OFF. Only the BM200 will reveal the true SOC state; else measuring with a manual voltmeter in the battery cellar.
As noted before by you and some other drivers, I think it is prudent to also provide a battery charger/tender if the car is left undriven for more than a couple of weeks. I went with a 5-amp charger, which I think is better sized than a common but cheaper 1-amp charger.
@@steevkeyes I'm glad to have an engineer who knows more about electronics. I'm just an amateur who knows a little and trying to help others understand why we are having so many battery failures. What practices can help prevent it from happening. Really interested in knowing more about your observations.
@steevkeyes - when you have a chance, please contact me at youtube@lsft.com.
After suffering my first flat battery on my 450h I found your video and it’s given me some essential tips on managing my battery charge in future. Still don’t know why a 6 month old car went flat overnight when nothing was left on. I had a laugh when you showed that driving the car for a good while with the engine on is no different to using EV mode when recovering from a flat battery - I could have saved the fuel and just idled in EV mode in the garage for an hour to fully recharge!
Even when the car is off, the 12V battery still on for the mobile app to pull data from the car like doors and locked, windows open and the status of functions. Also, you can see the nominal charge it does when you drive. There is no alternator on the 450h+, so the gas engine does not help charge the 12V battery at all. The 12V battery gets charged by the traction battery (high voltage battery) via the DC to DC convertor. Hope this video helps you understand how to maintain the 12V battery.
@@lsft I'll now be using my trickle charger on a regular basis for peace of mind. Dealer will be running a full test on electrical system this week, but I don't expect they'll find anything wrong.
@@marcusskinner4150 definitely good to have a check to ensure there is no unexpected draw on the 12V battery.
This video has been a god send after purchasing a 2023 RX450H+ and cleaning the car for the first time. Opening and closing various doors to clean and hoover out. Tried starting car later. Totally flat! Had to get AA out. This happened again but spent Less time with doors open but still flat battery. AA came out again. This is when I found your video. I bought the Bluetooth monitor which has worked brilliantly in keeping me informed on the state of charge. Noticing the battery can be around 50% charged most times and opening and closing various doors and hatch back soon lowers it. So like you say running the car on eV mode charges it up. Which I do now while washing my car! Never had to do this before with my 4 other Lexus's
So thank you very much for making the video and all your other videos. I find them really informative.
If you 12V battery got out 2 times, you should have it check to ensure the battery's health is good. Acid lead batteries fails when it loses charge. Dealership changed my 12V after it failed 3 times. So next service, you may want them to check your 12V battery. You just need to tell them that it failed twice and is concern about it.
Excellent work! Big thank you. For me, as one that drive very little (once a week or so), this charging behavior is very problematic. Lexus must change the programming.
In my car, I have a anti-teft location system. I noticed that the drain is about 10% per day. I need to charge the 12V battery every 5 days.
If you are draining 10% a day, you really need to start your car and let it run idle even if you don't drive it. Short drives cause issues and what I have notice is that you need to let the car sit a little longer to really see how much it drains after a short drive.
Thank you for your excellent video and detailed explanations! I love my 450h+ but my recent experience with the 12v battery crapping out in ACC mode in just 15 minutes has made me quite concerned if it happens in a remote location on a longer trip! In my case the jump starting was problematic as well since the hybrid engine would not fire up and I had to drive straight to the dealership with 12kms on the EV range!
Thank you for your comments. First thing. Never go into ACC mode. You rather use your EV range to keep it running. If you leave it idle for 15 mins you'll be able to charge up the 12V for sure. I've driven in road trips and it shouldn't be a concern if you drive it long enough or let it idle for a little time to ensure you have the battery charged.
Thank you for making this video, answers many of the questions I have. So I my battery went totally dead while camping because I kept opening the back hatch, doors, etc.. Next time I will keep the ignition "READY" light on when opening doors, etc. Any other ideas in lieu of a "ROOM MODE" like that the Rav4 Prime has?
The NX does have my room mode. I rarely use it as it makes more sense to use a level 2 charger.
Interesting.. does the My Room mode charge the 12V when the car is plugged in?
@@robwon8378 I haven't tried
Great work. Very thorough. Big thank you. What i took away from it all is that - basically it is a doozy - car randomly charges (or not) 12v battery while driving :( that is a real scratcher. Driving for 2 hrs and getting only 2% increase?! Buggy programming? I highly doubt that Toyota engineers have missed it while testing a pre-production model. They do drive with a computer connected and monitoring all the parameters. Very strange.
I'm very confused about that as well. Either the computer thinks it has enough juice and charging is not needed? I really don't know.
@@lsft Have you already seen "2017 - 2022 Prius Prime - 8.79 kWh Battery Removal" or "Low Voltage Hybrid and Electric Vehicle Systems" by Weberauto channel. He goes into details of 12v charging. You might find it interesting.
I am impressed with the effort you put into this analysis ! A very interesting point of view. On my side, I still have one question : what happens while the car is OFF and parked for some time, like a couple of days, without any interaction with the car (like no detection of any key or phone, nor using the app). I have read a post in a forum from an RX450h+ driver, which also experience the same battery issue as the NX450h+, and he said that his dealer observed there was some electricity consumed from the 12V battery while the car was parked in the garage, but could not determine when and what exactly causes this consumption...
On my side, my car is parked at a greater distance than the range of any key or phone, the car is always locked, and I always unplug shortly after the charging sessions are complete... From time to time, I test my 12V battery from the OBD port before starting the car, and I never observed any value lower than 11,6V in the winter. With that, I hope I can trust that my battery will not let me down !
Jean-Marc, What I have seen is even when the car is sitting, there is a drain. But keep in mind that I do have a dashcam that has parking mode ON and then the battery monitor which consumes 1.5mA and the dashcam consumes less than 1A (according to the manual). Around 6AM I assume it communicates the Lexus servers - but that could be it has learnt that I drive my car around that time frame every day and it either gets data or checks for updates. I see like a 1% drain every few hours. The battery management algorithms are quite complex and I have not been able to decode what is happening and it's very hard to know when it charges and when it does not. Even accessing the mobile app to get a refresh causes the battery to drop. I also tried putting keys in the faraday bag so no signals at all and there is still a drain. My concern is if I leave the car sitting for a week, what is the condition of the battery. That problem is I haven't been able to do that and it's hard unless I do go on a trip without the car. I might try to turn off parking mode on my dashcam to see if that makes a difference as well.
@@lsft Yes, I agree. The information I had from the driver of the RX having its car at the dealership, is that it consumed some electricity from the 12V battery every 10 minutes while the car was OFF, he said, and the dealer was not able to understand what that corresponded to...
Of course, the accessories generate some consumtion (dashcam, battery monitor, etc). On my side, my FitcamX does not have the parking option, and my OBD port reader as well as my AAWireless dongle are configured to turn ON only when the car is in ACC or READY, so nothing remains ON while the car is OFF.
But without taking into consideration the accessories, when you make a request from the app or trigger a remote command, my understanding is that, at least, the DCM is activated to establish the communication to the Cloud and to handle the corresponding data exchange (before eventually turning the car to READY). I also think there is a system in the car that constantly monitors the door lock functions so that, when a key is detected nearby, the door handles illuminate and the doors can be opened if necessary. In addition, in Europe, we have also the "Safety sensor" that monitors movements inside the cabin and tilt variations. So, my understanding is that the car consumes some electricity from the 12V battery while OFF and parked, at least for these 3 functions, at a minimum. But I have no idea how much and if it is continuous or by steps.
On my side, It happens on a regular basis that I leave the car parked for a week. When I am back, I generally check the battery from the OBD port before starting the car, and I never had a value below 11,6V... As this observation is consistent since I have the car, this value does not worry me.
Apart from that, indeed, the battery handling algorithms seem to be very opaque...
I think there is something with Lexus cars that drains the battery regardless. I learned this the hard way when I bought my 2002 SC430. I don't drive it much and I had to replace 4 batteries. I finally got a trickle charger. The SC4320 is basic but it had power seats and other components that was draining the battery. I have an NX350h and I will also put that on a trickle charger .
Any car if you don't drive often or drive short distances it would tend to have 12V battery issues. I've owned other Lexus vehicles and don't have issues if driven frequently.
Thanks for posting this video and your other one! I’ve been having issues with my NX350h and couldn’t figure out what was going on until I found your videos.
When you first installed the monitor, did the app immediately show 66% charge? When I installed mine it just showed 0% and slowly went up. I’m wondering if it was due to the state of my battery or I needed to run my car longer for the monitor to start tracking.
Mine did show 66% when first installed. I'm not 100% sure if the state of charge is always accurate. I do think it takes time to get the right state of charge. But you could monitor the voltage after the car has settled after for 30 to 60 mins.
@@lsft So it looks like the reading was in fact accurate. The car battery died after I posted this comment and I sent the car to the dealership to get it fixed. Luckily it was all covered under the warranty and right after I brought the car home and installed the monitor it showed a 68% charge. It’s been a couple of days since and now the battery shows 93%.
In speaking to the service advisor he mention that he’s seen a lot more issues with the hybrid vehicle’s 12v batteries and suspects it has to do with the batch that the factory used when they were mass producing the NXs. He did say once the battery gets replaced customers no longer have any issues - but then again only time will tell.
Thanks again for your insightful videos, I was really at a loss until I found them.
@deep818 glad they replaced your battery. I think it gives you a good sense of the battery overtime. I have noticed that the battery tends to stay in 60% range most of the time for me. Driving around and for the DC to DC to give 12.8V it surely charges the car a bit too slowly for many owners who drive short distances.
Time will tell if it improves, but I've heard from some owners they are on the 3rd battery.
Thank you so much for the video! Our 450h+ died due to lack of use. When I finally got it going I took it for a long drive (now thinking it might not have helped). So, I've decided to buy a trickle charger. Would you know the charging mode that I should put it on? So many options are available GEL, AGM, Flooded, EFB, Calcium, SMF🤣🤣
Thanks!
the 12V battery is a lead acid flood battery. I've been using flooded.
@@lsft Thank you!! Will give that a go😄
i own both 2022 nx 450h+ fsport(bought in june 2022) and lc 500 convertible(dec 2022). the nx's 12v died first in march 2023(lexus replaced it under warranty) then been using the trickle charge seldomly since i do not drive it much(total 3600miles driven as of today). then the 12v battery wouldnt charge anymore/became bad again back in last month(apr 2024), so lexus replaced it again. since then i've installed the ancel bm200 on both my cars after watching your video and been monitoring pretty much everytime i drive each vehicle. turns out my nx charges just like yours(trickle charging + charging while driving and more) while LC's 12v battery charges WAAAAAY faster. last week i started off at 54% or so on lc and drove only 7miles or so in local(stop/go regularly. did not go faster than 50mph for about 15min), and it already was at 95% or so after that ride. i wonder if this significant difference in charging between the normal ice 12v and phev 12v is normal... i just hope my 3rd nx's 12v battery won't go bad again.
I'm not sure how the SoC is calculated on the BM200. It does seem like it drops from 100 to 60% like in no time. It maybe more optimized for ICE vehicles over a PHEV. You definitely need to drive the NX more - almost 2 years and you have only driven it 3600 miles. I'm past 2 years and I'm at 25k km on my NX. I think an ICE vehicle with an alternator does charge the 12V much easier and 15 mins driving would give enough power. I have noticed even with 15 mins of driving, it does not seem to be enough to regain the power used to power up the vehicle. How does the 12V SoC drop when you aren't driving it on the LC? Does it drop as fast as the NX?
@@lsft it is much slower. i'll give u an update when i get the actual data later on.
if you can email me the screenshots it would be great. RUclips@lsft.com
Great work! I heard from other driver last week about her dead 12V battery on her NX450, and her dealer cannot figure out the reason. I am a little worry about it since I will be away for 2 months in the summer, and my car will just sit in the condo underground parking. What should I do to prevent drying out the 12V battery? I do not have a dash cam and for sure I will idle my car before I leave.
If you are going away for two months, you may want to ask the dealership if it makes sense to unplug the 12V while you are away. If you have a plug, you can trickle charger and have it maintain the 12V battery. Or if you have someone who can help start the car once a week and have it idle for 20 mins. But asking the dealership for advice would be the best.
Thanks LSFT - Have Lexus given any explanation?
I haven't reached out to them. The dealership won't have enough information to assist.
A tech guy told me that you should connect the negative lead of such a device to an earth point on the car chassis and NOT to the battery negative terminal. He says that these days there is usually a sensor on the negative terminal that sends data to the cars computer system and adding this device there can confuse it and cause problems. It works just the same from a chassis point and that could avoid any issues that may occur.
Not sure where I'll find ground. Been using it for almost a month with this setup and seems all ok.
@@lsft The leads are usually up to 9" long so you will have a decent total radius from the positive terminal connection to find a chassis point. He was pretty adamant that the negative lead should ideally be to the chassis and as he is a senior tech for Hyundai I tend to accept his advice on such matters. As it's usually a five minute job to move that black lead why would you not take such expert advice?
Hi - How does the12 v battery charge in EV only mode ( 450h+)
- if petrol engine is not turning over to charge the alternator?
Will it charge if idlling in Auto mode
( my NX450h+ only has EVC or AUTO mode
In ready mode the 12V battery is charged by the DC to DC converter. There is no alternator on the 450h+ and the 350h as well. Your NX450h+ should have the same modes as our NXs as well. When driving the NX does a very very slow charge to the 12V. If you watch the video you'll see how things work.
Probably a dumb question, but where are you getting SOC data? Is this the BM200 or somewhere else? My expectation is that estimating the SOC from the voltage w/o understanding how much current is going in/out of the battery or the actual battery chemistry is problematic. Thank you for looking at this more critically.
It's the BM200 providing it. I did state in the video, I don't know how it's determined by the BM200. They do let you state what type of battery it is. It's just a point of reference. More interested in the voltage and charging or not. The BM200 does reach 100% SOC when the trickle charger gets to the maintenance state. 🤷
@@lsft Thanks! It'd sure be nice if Lexus could say how/when they charge the 12V. Trying to externally reverse engineer their software fully is probably impossible, but even getting a gross sense of what's going on is very interesting.
@@koyamamoto5933 that's what I'm trying to do. I think it's complex and that is why Lexus doesn't tell us exactly how it is done.
Thank you this is very helpful! Answers many mysteries of how they deal with the 12v battery. Not sure if you've tried it, what if the vehicle is fully charged to 100% and you still plug it in? Does it do anything to the 12v?
Ah nvm, you tested and it will start to drain after 1 hour correct?
Yes. It started to drain about 1 hr later.
@@lsft what if the 12v is not fully charged, does the plug start to charge 12v when vehicle is fully charged?
@@PaulYason no. It does not charge. My understanding is only if the heater for the battery is on when the 12V is charged. I've charged the car a few times and it never charged the 12V battery.
@@lsft thanks, only in winter then 😂
@@PaulYason that's my guess. I'm going to see in the summer when it gets too hot if it will charge when the cooling of the battery is needed
One question. If I plug in level 2 charger at 6pm and schedule it to fully charge for next morning for 7am ( it usually takes 2-3 hours to charge but does it before between 4am-7am), will 12 volt battery drain significantly between 6pm and 4am just because it is plugged ? Thank you!
Unfortunately, I do not have a level 2 at home to try. There is drain for sure, but I do not know if it would drain a certain percentage. When your level 2 is pulled in, is there power connected to the car. Meaning does the app say it's plugged in? I personally have a smart plug and schedule the plug to give power at a certain time, so that the car does not think the plug is powered. So it doesn't think it's plugged in. I could do a 240V charge which takes 6 hrs and will try that and see what the outcome is.
@@lsft thanks. If u could check, that would be much appreciated. I am at my cottage without level 2 so can t check app to see if level 2 charger plugged in when put on schedule. Thanks
@@lsftso I checked the app when I schedule charging on level 2. When I plug in level 2 charger and schedule it to finish charging for next morning at 7am, the app says charger is plugged in but not charging. Does that mean it is draining battery? How much?
Does this mean it is always better to schedule charging via the home EV charger and not via the car as to not drain the 12V battery??
That seems to be an oversight by Toyota/Lexus.
And does this mean that we should never schedule charging via the car as to not drain the 12v battery?
@@LucLuong-dq3bn I don't have the answer for how much it will drain. I want to clarify that it's not abnormal for the 12V battery to lose energy when you have the charger plugged in. Even your smartphone will lose power by just idling and you not using it. It does not mean that it's not doing anything. When you plug in the charger, a few things is happening. 1. The car is monitoring the systems to ensure nothing fails since there is a power current plugged into the car. 2. A timer is running to ensure it calculates when it the best time to start charging (monitoring battery temperature, outside temperature, when to start the starting, etc...) All of those activities require energy.
From a safety perspective, they do not want the high voltage battery to be active during this time. They rather have the 12V battery run and not connect the traction battery for such activities.
As per scheduling - I do think that scheduling the charger via the EV charger would reduce the uses of the 12V battery, but it may not give you the timing of departure as accurate as the car can give you. However, I have noticed that the car tend to finish charging before the time set.
For my purpose - I have a smart socket and I have timed the smart socket to give power at a predetermined time (example 1am). Then the car will get power and determine if it needs to start charging or not. Typically I would set it a bit earlier.. so the usage of the 12V would be less than letting it sit overnight.
@@lsftunfortunately I don’t have a smart level 2 home EV charger and that is why I set schedule via car.
From what I understand from your video, there is less 12v battery drain while charging on level 2 than simply being plugged in without charging. Is that right?
At 32 amps it takes 3 hours to charge. At 16 amps, it takes 6-7 hours. At 8 amps, it takes 12-14 hours.
In that case, would it be better for me to set lower amperage (16amp or even 8amp) on car charging setting to have less time being plugged in ( without charging) and more time on charging to have less 12v draining when I set schedule?
I want car to fully charged only at 7 am and keep it at 100% too long. I want to be able to plug in at 6 pm and not be obliged to wake up at 4 am to plug in at 32 amps. So would it be better to lower amperage for it to take more time to charge and drain less 12v battery?
Do you know if the 12v gets charged when the car is started using remote connect?
I can see it does not say "ready" mode on the dash but the car must be using the traction battery when the car is remote started to run the Air Conditioning...?
Or is the car effectively in accessory mode and am I effectively draining my 12v battery whenever i remote start the car to precondition it?
It does charge. I'm working on a follow-up video that would explain that.
do we know if normal hybrid NX charges same in neutral while Ready mode?
You mean in idle? Not neutral? I don't know, I would assume it would be the same.
@@lsft meant park i think, is that same as idle
@@kent2174 yup. What you can do is get a voltmeter to check at your 12V plug. If it goes to 13V or 14V it charges.
Thanks for the info I was wondering about 12 volt battery in a nx 350 h. If u don’t drive for a few weeks. Will it die?
@@regdrums1 I don't think I can give your a definite answer. It all depends how much you drive, the situation and temperature as well.
Hi … ive had my 450h+ F sport for about 3 weeks . I just suffered the dead 12 volt battery issue while waiting to catch a ferry . Listened to the radio for 45 min then boom … dead .
Ive seen how some batteries from Japan were faulty and some people got new batteries . My dealer said my battery was fine but now im questioning this .
I was able to jump start the battery and left the vehicle idling for 45min which allowed me to drive normally . I listened to the radio for about another 30 min coming home at ferry terminal but this time starting the gas engine on occasion to ensure it would start ( it did ) .
2 days later after watching your video , i thought i would check the voltage and battery percentage and it said my 12 volt battery was at 11% charge !! Ive plugged in 1 time in that period … In my opinion this is not normal .
So i’m wondering if a new 12 volt battery will stay charged better or …is that just the way it is moving forward with this car .
If you go on a ferry, just let the car run on EV mode while you listen to the radio. That should be enough to charge it to ensure all good. Running in ACC mode without ready mode light will definitely kill the battery. I had mine replaced and I'm still seeing normally 60%. But I'm not 100% confident that the state of charge is accurate. I could use my trickle charger and the charger would go into maintenance mode and the SoC is sometimes 80% only. It's just an estimate it seems. It's typically ok. Mine died and boosted and 1 year later is when it died again. Then it got replaced. Should be ok for now. But it does seem that the 12V battery needs to be babyed to ensure it's all good. Especially if you use ACC mode or drive short distances.
Ok thanks for the quick response .
Leave the car in ACC mode and see how long it will take to drain the battery, do with AC on, heated seats etc., then with everything off, or see what just opening and closing the doors does, or leaving the doors open etc while the car is in ACC. You know just for all those people who killed their batteries while doing nothing haha
From what I observed, you can easily kill the 12V battery in ACC mode if you aren't in full. I've had days where it's already 50ish% by just normal usage.
👋 It happened to me (by accident) in less than 20 minutes.