this post was submitted on 24 Jun 2024
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As far as I understand, that 12V battery was that backup...
Not anymore, they've updated the platform to be 48v (which they shared the docs with the rest of the industry) and are using lithium batteries in both systems instead of lead acid. They're supposedly supposed to last the lifetime of the vehicle instead of having to be replaced every 4-5 years.
https://electrek.co/2023/12/07/tesla-shares-48v-architecture-with-other-automakers-to-move-the-industry/
https://insideevs.com/news/656775/tesla-switch-48v-voltage-system/
Only the cyber truck. Model S and 3 refreshes are still on the legacy platform, with a lithium ion 12V.
In this story, it's the model y.