In ExMachina, the A.I. robot successfully escapes. But we learn earlier, that it can control the power failures, by reversing the direction of electric current (or some technical stuff like that).
Bear in mind, that the process of reversing the current, is done remotely. No physical contact with any power panel is necessary.
The A.I. robot states that it can do the power failure while its battery is charging.
Having known all of that, how will the robot survive in the out-world without a mean to charge its own battery?
She/it must return to the facility where its battery can be charged...