Ran into a battery drainage issue this past weekend. Drove my ES300h on Sunday morning and then on Monday morning, car's battery was dead and the car would not start. Symptoms included flickering lights, clicking noises, and an intermittent warning message on the display stating roughly 'Elec Access System Malfunction'. Was not sure if this was a battery issue as this is my first foray into hybrids. After Roadside Assistance came and jumped the car (I was told by Lexus not to do this myself - which I probably will just do next time), 'Check Engine' lights remained and I decided to take it in to make sure nothing was wrong. After a lengthy wait at the dealership, it was decided the auxiliary battery was completely drained and needed a full recharge. Battery diagnostics came back fine. Not sure on their end why the battery died. Car was purchased new in September 2020. Supposedly one of their most reliable and durable batteries, being a higher end gel model. Has anyone experienced this in their hybrid?
A couple of notes:
- Use a sunscreen on the windshield so I prop it up with my visors. One thing different this weekend as opposed to others is the fact that the mirror was left open but once the visor is fully extended, the mirror light turns off. Even if the light was on, would it drain it in a day? Or is leaving the visor open in general, mirror open or not, slowly draining the battery?
- I have a dashcam (A119v3 - capacitor powered) and a phone charger plugged into the center console DC port. This should disconnect completely once the engine is cutoff no?
- No other interior lights were on.
- All car doors and windows were closed - both the car locks successfully and the app did not notify me of any status otherwise.