Classic cars forum & vehicle restoration.
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Ray White
Joined: 02 Dec 2014
Posts: 7216
Location: Derby
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 Posted: Thu Nov 13, 2025 5:04 pm Post subject: |
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| Penman wrote: | | +Ray: there is probably an AI chip in the battery which is programmed to sulphate the battery at 3 yrs +1 to 5 days. Or it might just trigger a dead short. |
I wouldn't be surprised!
What would surprise me though is that Lexus would could allow such a thing. Their reputation hangs on the reliability of their cars and having a customer be let down without a moment's warning is not a good look. After all, they guarantee their main battery ( in this case a hybrid) for the life of the car so long as they continue to service it. With this kind of deal, the residual value is also enhanced; which is not to be sniffed at.
Putting future car sales at risk for the sake of a 12 v battery doesn't make financial sense which ever way you look at it.  |
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Rusty
Joined: 10 Feb 2009
Posts: 286
Location: Bunbury, Western Australia
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| Posted: Fri Nov 14, 2025 2:16 am Post subject: |
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| Ray White wrote: | Just as an aside; the 12 v battery in my Wife's 2022 Lexus hybrid failed the other day. She uses the car on a regular basis and has it routinely serviced by the Main Dealer.
The battery had a three year warranty and it died literally overnight... virtually to the day of the warranty expiry!!
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I "dont" get that ! I retired my old olden Jackaroo several years ago and its battery was put in August 2014 and when I took it off licence, I gave the battery to my brother who is using it in his old Landrover farm paddock hack. It is still going now, even at over 11 years old, so if one can do it why can't they all, (or at least "most"). |
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ukdave2002
Joined: 23 Nov 2007
Posts: 4267
Location: South Cheshire
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| Posted: Fri Nov 14, 2025 9:27 am Post subject: |
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| Given the sudden failure, Ray's wifes Lexus battery has probably had a simple failure of connection between cells or the posts. In 3rd world countries they would cut the top of the battery off, repair the connection, glue the top back on and after a few mins work have a perfectly usable battery. |
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Ray White
Joined: 02 Dec 2014
Posts: 7216
Location: Derby
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| Posted: Fri Nov 14, 2025 12:34 pm Post subject: |
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| I was a bit disappointed that the Lexus people stuck to their guns and insisted Jean pay for a new battery. They did at least fit for free... but I could have done that in a few minutes. |
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petelang
Joined: 21 May 2009
Posts: 474
Location: Nottingham
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| Posted: Sat Nov 15, 2025 5:54 am Post subject: |
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A good battery, providing kept charged, can last 15 years. The one on my Daimler V8 250 is now 14 years old, needs a frequent recharge but still starts the car.
_________________
Daimler Fifteen 1934 (now sold)
Armstrong Siddeley 15 Long 1933
Daimler V8 250 1969 |
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ukdave2002
Joined: 23 Nov 2007
Posts: 4267
Location: South Cheshire
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| Posted: Sat Nov 15, 2025 5:10 pm Post subject: |
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| I would have pushed the Lexus dealer, especially if they provided the vehicle new. Warranty is a statutory thing, if you bought the car new in good faith, the one would expect a battery to last more than 36 months. Martin Lewis does a great explanation of this, I think given the sudden failure this is a manufacturing defect, Lexus (not the dealer) should cough up. |
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Ray White
Joined: 02 Dec 2014
Posts: 7216
Location: Derby
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| Posted: Sat Nov 15, 2025 6:16 pm Post subject: |
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| ukdave2002 wrote: | | I would have pushed the Lexus dealer, especially if they provided the vehicle new. Warranty is a statutory thing, if you bought the car new in good faith, the one would expect a battery to last more than 36 months. Martin Lewis does a great explanation of this, I think given the sudden failure this is a manufacturing defect, Lexus (not the dealer) should cough up. |
I wonder if Lexus were responsible for the 12 volt battery? They shoulder responsibility for the main (hybrid) battery but the smaller one may be regarded as just a service item.?
They were aware that these had a short life and that the end could be sudden but they insisted if it was out of warranty; it was out of warranty. Hard luck. |
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