I used my spare key fob a few months ago for my 2010 LS and the battery was dead. I bought a battery at the drug store, installed it, and the next day it was dead. Thought it was a bad battery, so I bought another, which died the next day. Since then, my Lexus dealer has installed three more batteries, the most recent was yesterday (1/14/14) and they have all died in one day.
It is not kept near anything that would emit a ping and drain the battery.
I think the fob is bad and my dealer insists they never go bad.
Anyone else have problems?