I was clearing out hotel not knowing that a quest was involved. Well, I found the Proctectron and took the battery out of it, then I dropped it because I had no room for it. After clearing out the room I proceeded to the roof and met the rangers, Donovan told me about the battery so I went back to look for it. After searching for 30 minutes to no avail I could not find it. You cannot exit the building or fast travel and none of my saves are close enough to where I am to go back. Can someone please help?