Last week my 08 IS250 was showing "low battery" warning.
Then I took in to the dealer for some warranty work like blown cig lighter fuse and vanity light.
Next day when I pick up the car, the low battery warning is no longer there.

Do you think they changed the battery? It does not show on the worksheet though.

They probably changed it......

If it doesn't come back in a day or so, they def changed it.

They change it for free whenever I go there and ask +1 Lexus service

thats nice gonna pass by my dealership soon mine is showing up the lil low battery message jejeje

I saw it maybe 2 weeks ago, and they said just to drop by parts and they'll put in new ones. I also brought my spare, they replaced both, checked the batteries which were low and really low, no charge.

That's funny! I posted an identical thread two months ago with the exact same situation. I was getting the warning, spoke to my SA about it, but he said "no" to a free battery. Then I get my car back after service and the warning was gone. Yet on the invoice it didn't say they replaced the battery. It just said the cause was a low battery. Not knowing what they really did, I monitored it for a few weeks and concluded they must have changed it since no warnings have returned.

I guess that is Lexus service.

I guess I never mentioned that on my Rx300 the remote cracked and broke.
It was replaced under warranty.

+1