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this post was submitted on 04 Aug 2025
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To my knowledge, the Tesla still has a 12 volt battery that has to be separately charged if you leave the thing off for more than 2 weeks.
They used to but not anymore, they now have a rechargeable lithium 16V battery.
So they went back and fixed all of the old ones? That's not something I had heard of, tbh.
No the old cars do have the old 12v one in still. They obviously learned its a bad idea. Newer models don't have it and have a lithium rechargeable instead.
Will it still run that dead in sentry mode while the engine batteries remain charged and unused?
I'm not sure of the intricacies but this change was made to avoid the dead 12v situations. I imagine now as the main battery can now recharge the lithium one easily it keeps it topped up somehow to avoid this happening.
I left my Tesla for nearly 3 week holiday not plugged in and it was fine when i came back.
Yeah, I expect it should last longer, lithium has a higher energy density.
It sounds like a patch, not necessarily a fix. If it sat too long you'd likely still end up in a similar situation.