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2020 ES 350 Battery Dying After Sitting for a Few Days

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Amanda S. · rep 0 · May 22, 4:46 AM · 1 replies · solved · Question

Vehicle: 2020 Lexus ES 350 Luxury

I have a 2020 Lexus ES 350 Luxury, and lately, the 12V battery keeps dying if the car sits for more than 2-3 days. I've had to jump-start it twice this month. The battery was tested at a local auto parts store, and they said it's "good" but low on charge.

I don't leave any lights on, and I've checked for anything obvious drawing power. Could this be a parasitic draw, or is the battery just not holding a charge well anymore despite the test? What should I be looking for?

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 4:46 AM

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ClearTheCode admin answer:

It's concerning when your 2020 Lexus ES 350's battery dies after just a few days. While the battery tested "good," a low charge indicates a problem. Here's a breakdown of potential causes and steps:

  1. Battery Age and Health: Even if it tests "good" under a basic load, a battery approaching 3-4 years old might not hold a charge as effectively, especially in extreme temperatures. A more thorough battery test that measures cold cranking amps (CCA) and internal resistance might reveal its true health.
  2. Parasitic Draw: This is the most likely culprit. A parasitic draw occurs when an electrical component continues to draw power even when the car is off. Common sources include:
    • Aftermarket accessories (dash cams, alarms, remote starters).
    • Stuck relays or modules that aren't shutting down properly (e.g., infotainment, navigation, keyless entry).
    • A faulty trunk or hood light switch.
    • A glove box light staying on.
  3. Charging System Issues: Less likely if the car runs fine after a jump, but a weak alternator might not be fully recharging the battery during drives. This can be tested by measuring voltage while the engine is running.
  4. TSBs/Recalls: Check with a Lexus dealership if there are any Technical Service Bulletins or recalls related to battery drain or specific electrical modules for your 2020 ES 350.

When to See a Shop: A parasitic draw can be tricky to diagnose. It requires specialized tools (like an amp meter) and knowledge to safely test each circuit. If you've ruled out obvious culprits like lights left on, it's highly recommended to take your ES 350 to a qualified mechanic or Lexus dealership. They can perform a parasitic draw test to pinpoint the exact circuit or component responsible for draining your battery. Ignoring it can lead to premature battery failure and leave you stranded.

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