Battery Dead Problems of Lexus ES

Cpo 2013 Es350 bought January 2, 2016 at Lexus dealership, which has been kept in an in-door garage, and is lightly driven. Mid-April 2017 battery was dead, jump started but then battery died the next day. I brought vehicle to another Lexus dealership on may 20, 2017. They claimed battery not warrantied. I discovered the original owner who bought car October 2012 had replaced the battery in 2015 which made me curious as to why it was replaced so soon, and why it didn't last very long. The service manager then mentioned that I needed a computer component which he hoped was under my warranty and they would call me when the part came in. I researched this part, and apparently Lexus has known problems with this component, which was probably defective causing battery problems by not going into "sleep mode" and slowly draining and killing batteries. There seems to be many other complaints similar to mine on blogs (one of which is attached).

See all problems of the 2013 Lexus ES 🔎.

This is the second time in two years the battery has died on this car. The first time was August 2014, just one month past the car one year mark. The second, that is why I am writing this complaint, is almost one year to the day of the last battery failure. While the first may be written off as a bad battery, I do not believe in coincidences and feel there is an electrical problem with this car. I have seen other complaints on-line so I think there is something more to this problem than just bad batteries.