I have a 2007 ES350 Lexus having same issue buy the brand new battery in 3 days battery drops to 60% that's with the driving everyday end up pulling out alternator took it to AutoZone for test pass then next morning took it to O'Reilly's Auto Parts and the alternator fail test it's only produce 11.5 volts when normally should produce around 14 volts
This has happened to me TWICE in the past 4 months. I had Lexus road side service come out both times to check the car out. Each time the battery was totally dead. The road side mechanic said that if the car is not driven at least 15 minutes nonstop a day, the battery runs dead as there are so many draws from the car on the battery. If you do alot of stop and start driving like I do, that isn't enough to recharge the cell of the battery, it must be non stop driving time. Recommend that I get a 1.5 tricky charge device an hook to battery at least one night a week to keep the battery charged. This is really frustrating with such a new car. I've spoken to other owners of other model luxury cars and no one has had this problem.
SOURCE: Subaru 2009 battery problem
it is possible with clocks and such to drain the battery after 2 weeks. if you can't let it run for a while during that time, just unhook negitive battery cable untill ready to use.
SOURCE: battery goes dead on 2004 pacifica
There is obviously a draw from somewhere, and if your dealer doesn't have a mechanic who knows how to narrow it down to the circuit causing the problem, then I'd question there ability. With that said, when all else fails, you simply remove negative connection off battery first, then positive. Take a 12 volt test light & secure one end to the + clamp or connector, and the other end to the battery+ post. Now connect your negative back up to the battery as it was. If that test light, lights up, there is a draw. It will be brighter, the more draw there is. Your going to have some, just from your radio memory alone, but now comes the fun part. All you do is pull the fuses one at a time, if light goes out, or dim's you've found a draw. When you have a real hard one to narrow down, you make sure you know where they all go back to, whether by your map at fuse box, or your own notes, and you pull them all out, and light should go out for sure, if not, there is another circuit or panel, or relay drawing the current. If it goes out, you start putting them back in one at a time, and when the light comes back on bright, you found the circuit. Mark that one down, pull the fuse back out, light off, now do the rest that you haven't checked yet, just to see if there is more than one draw causing the problem, if there is, mark it down, pull it out & continue on until all done. Now you/they narrowed it down or isolated the circuit causing the problem.
SOURCE: battery dead in 2006 lexus ls430
well i would start with testing the alternator first. meanwhile get a battery maintainer/charger to charge to battery while not in use.
the alternator test will tell you if the alternator is charging the battery while driving or not. usually your local autopart store will test it for free
SOURCE: battery goes dead overnight on four occasions
I dont think the dealer knew what he was doing ,your altenator has 6 diodes inside it and the are a one way check valve for current,If one fails no light will come on because it is still charging,But will drain your battery,I hope this helps you and have a merry x mas and please dont forget to vote on this solution
SOURCE: my lexus ls400 cranks over but wont start also the car goes dead
this could be a starter or the enigtion swicth yes if you crank the key to long it will kill the battery.
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