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2024 Lexus RX — battery dies after the car sits for a weekend

UsedCarHauler419Community StarterOct 5, 20252024 Lexus RX 350hOrlando
2024 Lexus RX 350h, about 22,500 miles. Battery passes a quick test and charging voltage looks normal, but after two or three days parked the car sometimes will not crank. What is the cleanest parasitic-draw test on a modern car that takes time to go to sleep? Mostly looking for the right next step.
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3 replies

WrenchRoadie234Community StarterCommunity StarterOct 5, 2025permalink
I'd treat 12V warnings as a no-ignore. On the 2024 Lexus RX, I'd get the 12V/DC-DC side checked even if the traction pack looks fine. Then you'll know the next fork. On “battery dies after the car sits for,” that was the fork that mattered for me. Keep sale price, fees, and rate as three different conversations. Climate here is different, so treat that as a local data point. Not driving it hard until I know more.
CanyonSeller690Community StarterCommunity StarterOct 6, 2025permalink
Don't clear the alert just to make the screen pretty. Leave the alerts on the 2024 Lexus RX so service can see what you saw. Then you'll know the next fork. That's the whole play. I'm in no rush to be a hero on it.
ShopEnthusiast444Community StarterCommunity StarterOct 6, 2025permalink
I'd push back a little: Match starting SOC and battery temp if you're comparing 2024 Lexus RX charge sessions. I'd do that before spending real money. This is from a 2024 Lexus RX in Orlando with 22,500 miles. Had a similar mess a couple years ago and that's what finally sorted it. Cold start is when I can actually reproduce it.
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