Remote keyless entry and the cost of batteries

[Apollo14]

Not speculating. The constant on is confirmed if you look at various sources eg Wikipedia.

Remember the signal is very very low power since it is a few feet.

Then factor in the battery lasts about 2 years whereas it would last much longer in a traditional remote that uses more power each time a signal is sent since it goes further.

Lastly, I have some windows that are wirelessly connected to my alarm system. I'm seeing several years usage from those button batteries. They are always on (the alarm system reads their status eg low battery)

 

[Eddie]

The battery in the smart key for my 2007 Mazda lasted until I sold it in 2014.

 

[Apollo14]

^ Did Mazda have smart key in 2007?

The Toyota ones batteries apparently last for 1 to 2 years.

There's a TSB saying to keep it away from electronics because they might activate it and run the battery down.