Keys for opening and starting your cars? How very 20th century..

Ours all have keyless entry and starting. Get close enough to the car and it will open when you touch the door handle and you can start it with the key remaining in your pocket. Once you park and stop the engine, walk away and it even locks the cars for us.

Battery life? Well mine is 2.5 years old now, and when the battery voltage drops the car even gives you a warning message that the battery needs changing.