So I am looking at a Toyota Estima with Push Start and most cars that suit me come with ONE key.

THere is NO PHYSICAL KEY so we are advised to keep a spare battery in the glove box in the event the key runs out of battery.

Some dealer says they can get a separate key from TOyota, some say from Japan, some say from a NZ registered key company (what is that?).

What are the chances that a key will fail for some reason and then you are stranded?

Also any tips and advise appreciated.