According to my manual, there should be an audible alarm. I don't see anything in the manual about disabling the alarm.
I assume MID = "Main Information Display"

Electronic key battery depletion
● The standard battery life is 1 to 2 years. (The card key battery life is from one year to one year and a half.)
● If the battery becomes low, an alarm will sound in the cabin when the engine is stopped.
● Battery-saving mode can reduce the

 

Viktor is the man:

 

Thanks gentlemen. Since I don’t want any surprises, I will change mine on schedule. I generally don’t keep cars long enough to worry about changing the battery, but this ES is a keeper.

 

Thank you hotwings, you da man or gal.

 

Storing your smart key close to your car will shorten its battery life.

 

Faraday bag.

 

And also drain the auxiliary battery. Park ours under house and wife puts pocketbook on chair right above car. Her fob battery lasts 2 3/4 years.