NJLexGirl

The car definitely wasn't on in the "Acc" mode, but I can't recall positively whether or not anything was in the cigarette charger - occasionally I do have the charger plugged in for my cell phone, but I try to leave everything off/unplugged when I park the car. Six days into the new battery and so far so good! But I've been using the car almost every day this week. Thanks for all of your input. I am OK with it being just a bad battery, as long as it doesn't happen again. Both dealerships I spoke to also suggested the trickle charger. I will hold off for now, but I may get one in advance of a long vacation I will be taking in November. I'll keep you posted!

I joined this forum in the hopes that someone else has experienced the issue I just experienced with my 2.5 month old 2007 IS250 AWD. (This is my first post!) I was away for business, so the car sat idle in my garage for 11 days (although I don't drive it daily anyway). On Day 11, I found that the battery had completely discharged. Lexus Roadside Assistance sent someone over and jumped the car, and it started up right away. I let it run for 20-30 minutes, and believed that would be the end of it. The next evening, I went to take the car out, and the car was dead again. Fast forward through several calls over that night and the next morning to Roadside Assistance, which included 2 different guys coming to try to jump the car, and the car still would not start either time. Roadside Assistance suggested trying to reset the security system, but that didn't seem to work either. Finally, a Lexus technician came to my house to work on the car. (Awesome service by Englewood Lexus in NJ!) He replaced the car's battery and ran some diagnostics. He thought maybe one of the fuses was drawing too much from the battery (in the radio panel?), but suggested I take it in for service to be sure. The dealership found nothing wrong with any fuses, etc, or anything else, for that matter. Here are the theories that came out of the service visit, and a subsequent conversation with a different Lexus dealership's service department: - The car was idle for too long and the car's battery just died, which is "normal" (?!?!?!) after sitting for almost 2 weeks (could this possibly be true?!); or - The battery was drained because the SmartKey (upstairs one level in my apartment building, which is constructed completely out of concrete, fyi) was trying to communicate with the car for 11 days; or - Just happened to get a bad battery. There is no reason, as far as I'm concerned, that a 2.5 month old car with less than 2700 miles on it would already have a battery issue (unless the battery was just bad to begin with). I'm having a hard time believing that 11 days of no use would drain the battery. It also doesn't make any sense to me that the keys would (or even could) be draining the battery for 11 days. (I was told later that the car goes into passive mode after 1-2 days of it "searching" for the key.) Has anyone else experienced this? Or heard any of these reasons? I'm trying to find out how to avoid this in the future.