Dead 12v battery Incident (merged threads)
Driver
Joined: Jun 2024
Posts: 71
Likes: 44
From: DE
Pit Crew
Joined: Nov 2024
Posts: 194
Likes: 127
From: NOTL ON Canada
Racer
Joined: Oct 2023
Posts: 1,274
Likes: 1,067
From: CA
LIke yours, I have the ES1200 and my firmware is the same, PSA1.0.15. The voltage %-age is shown in both the basic info screen (next to the little green battery) and the the next screen, U.I.T.C., where it is shown as a bar graph. Both indicate 27% and 12.7v. Individually, the four separate cell banks are all above 3v, at 3.14v to 3.17v. The 18650 Liion cells are normally 3.7v each so, it's odd that they would be discharging across the board so rapidly in less than 24 hours.
Pit Crew
Joined: Nov 2024
Posts: 194
Likes: 127
From: NOTL ON Canada
Instructor
Joined: Nov 2023
Posts: 972
Likes: 636
From: California
I think WellsB uses Android - the iOS version of the App has had the version 16 for a few months now. Its viewable and update is available at at the bottom line of the main view of the app (which has name of the device - just clicking it does the trick showing you any update available), the one that shows just after opening the app.
Racer
Joined: Oct 2023
Posts: 1,274
Likes: 1,067
From: CA
Yes,I have Android and the app is version 5.2. It's the device firmware that updated, not the app. It may have been available longer, but I had not checked since mid-October, when no firmware update was available.
Driver
Joined: Jun 2024
Posts: 71
Likes: 44
From: DE
Thanks, saw your screen shots after I'd possted. I googled difference btw BM 200 and 300 and my BM 300 doesn't have that feature. So I'll have to do the manual calculation using time to charge. Thanks again.
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Intermediate
Joined: Oct 2001
Posts: 386
Likes: 57
From: NJ
Clean Assist and Drive Pulse are accessible through the app - switched them off by going into my "Account" after clicking the headshot icon on the top right of the phone app screen. So that the car is not required to send these useless location data and other stuff to the servers. So right now, I just have those settings on that I actually need/use - such as alerts for having left the windows etc. open, but none of the other nuisance.
Funny how I don’t get an alert about batter/electrical problems…😡
Rookie
Joined: Jul 2024
Posts: 43
Likes: 15
My 450H+ just came back from the dealer (regular maintenance) . Two years old and we've only put about 6000 miles on it. When it was new we got locked out of the car in our garage because the battery died over night (wtf?). Luckily Lexus phone support talked me through breaking in and charging the battery. I haven't had any incidents since then, but when they gave me the car back they said that they replaced the battery as it wouldn't fully charge. Odd.
Instructor
Joined: Nov 2023
Posts: 972
Likes: 636
From: California
Head-symbol on App's top-right corner -> Privacy Portal and Legal Info --> Vehicle Specific Settings --> Finally arriving at the screen shown below.
I had gone into "Clean Assist" and "Safety Sense Video Capture" to revoke consent so that the feature is deactivated (everything was activated by the Lexus "genius" at the dealership on delivery).
Keep in mind, I can't guarantee these will help in any way, but when about a year+ ago, we were being conservative with items that might have helped with battery drain. In any case, these were privacy red-flags to me, so I'm happy to have kept switched off. ""Clean Assist" claims to find EV drivers in California with 100 % renewable electricity" - it may not even be there outside of California, and seems quite pointless if one charges at home or work relevant for PHEV, which I do.
My 450H+ just came back from the dealer (regular maintenance) . Two years old and we've only put about 6000 miles on it. When it was new we got locked out of the car in our garage because the battery died over night (wtf?). Luckily Lexus phone support talked me through breaking in and charging the battery. I haven't had any incidents since then, but when they gave me the car back they said that they replaced the battery as it wouldn't fully charge. Odd.
Instructor
Joined: Jun 2023
Posts: 941
Likes: 506
From: NJ
Lexus-provided battery has 8 year warranty, and you can keep replacing the battery on Lexus' dime through the life of the car you own.
I've been tricked with those deals before. The pro-rated replacement sometimes costs as much as purchasing a discounted new battery...just saying.
Another warranty experience: Our company car's transmission needed a rebuild at 12,000 miles. Fine, no issues or cost.
But the trans needed ANOTHER rebuild after another 12,000 miles. Even though the manufacturer's warranty was 36,000 miles on the trans, they claimed that the factory warranty didn't apply because of the rebuild. Luckily for me, the company had to shell out the $$$.
Racer
Joined: Oct 2023
Posts: 1,274
Likes: 1,067
From: CA
The Lexus 12v battery is covered under the 4-year/50k mile basic vehicle warranty. Lexus replacement batteries have a 2-year free replacement then prorated from year 2 to 7.
Last edited by WellsB; Dec 6, 2025 at 05:50 AM.
Instructor
Joined: Nov 2023
Posts: 972
Likes: 636
From: California