I have watched many videos of aluminium air batteries and it got me wondering. Could this same process work if you stored the aluminum in vacuum and exposed it to oxygen? For example: A high surface area aluminium plate is in a glass bulb under high vacuum. A copper lead connects to the aluminium to a load. If we break the bulb the aluminium will rapidly oxidize. How do you close the circuit? I know you could ground it but what about in aportable application? Reusability and controlled current flow are of no concern.