Key fob eats batteries -- will it always start when put close to button?

What year is your Prius? Did you drop the keyfob in the water? Very often the "Lock" button gets stuck.

If you haven't got your answer by trying it, I'd be surprised. The answer is "Yes." Just curious, why would you ask such a silly question or not read the manual first?

Also, the manual is probably where I'd start first to find out why your Fob batteries are depleting so fast.

...unless you enjoy the social aspect of service calls.