User blog comment:TheFreddyFromThePizzaria/FNAF is NOT impossible guys!/@comment-25588272-20151123141142/@comment-26186871-20151123205509

It could be for about 24 hours. Free-roaming mode was taken away, and the robots do fine for 18 hours!

Yes, it does lock up by running out of power. That's why at the next night you get power back instead of it just staying like that for eternity. Come on guys, do you serioisly think a battery could power an entire building? ;)

Locking up is an effect of running out of power though. That's one of the many ways it can lock up.

Well, how EXPENSIVE are servos? Yes, they are quite easy to install, unlike the parts and service room, but still! Also, Fazbear Entertainment surely doesn't WANT to lose parts all the time! As a result, in order to not have to spend money on it every day, they jist put free-roaming in place. As the Phone Guy said, for Fazbear Entertainment, there's nothing to worry about them free-roaming.