2021 Toyota Highlander — battery dies after the car sits for a weekend

Start with the test that can prove you wrong. Write temp, speed, and in-gear vs coast when the 2021 Toyota Highlander does it — then decide on parts. You'll know quickly if you're on the wrong tree. Run the total, not the monthly, before you commit. I've seen both outcomes, which is why I'd test instead of assume. Not driving it hard until I know more.

If it were in my driveway, move a coil or plug on the 2021 Toyota Highlander if it's cylinder-specific and see whether the code follows. You'll know quickly if you're on the wrong tree. I'd want that in writing, not as a promise. Only after sitting overnight so far.

It did battery dies after the car sits for twice this week, both times after sitting. No change in mileage feel. Video is ugly but it shows the hesitation.