2017 RX 350. Car sat for a month or two. Battery completely dead. No lights on dash. Nothing. Replaced battery. Car still seems dead. Nothing happens. Thoughts?

 

Inspect around battery box/under hood for evidence of mice or rat droppings; critters may have chewed into a wiring harness. Also, double check the voltage on replacement battery ;wouldn’t be the first time a “new” battery is low or dead. Good luck.

 

2017 Model, 2 years old, seems strange for the battery to die that quick. Something else is going on. Head scratcher. But yeah if some creature got to your wires, that’s a possibility. Is your garage sealed?

Do you have a multi meter to check on voltage?

 

Not a surprise!
On today's vehicles there is a low & continuous draw to operate all the electronic gadgets and if one doesn't use that car for 2 months there are only 2 solutions:
1) Disconnect the battery or
2) Hook it up to a charger
If one doesn't do either the result will be a dead battery. Once this happens the vehicle must be "resuscitated" but it depends on vehicle/make, did you call the dealer?

 

I agree, 1-2 months is too long to let a modern car sit. I'm a snow bird and I leave my RAV4 in the garage for the winter. I use a battery maintainer on it (not a battery charger). I use various anti-mice things in the garage and when I return in the spring, I disconnect everything, get in and it starts like the day I left it.

 

Nice - where do you head for the winter?

 

East coast FL Boynton Beach. We drive the RX down, take 3 relatively easy days, except for the occasional traffic jam/accident.

 

Nice. We have a place on the west coast - Sanibel Island but we're not quite snow birds yet😀 Just get down there maybe twice per year for now.

 

When you state it "seems dead" did the dash lights come back on after replacing the battery? If so, might you be encountering the following: RX350 Won't Start-Brake Pedal Hard