Update - and having an appointment to replace your battery DOESN"T actually mean Apple is going to replace your battery. I found that out yesterday - as did many many others - Apple uses the appoint to gather information an ORDER you a battery, so that you get to come back AGAIN. One would think that Apple would call, text or email to notify you, but one would be wrong.
You also must have the Apple ID password in addition to the passcode for additional security. However, that makes no sense, because if you have the passcode you can simple reset the password without knowing it. I also had the phones of a couple others and had to reset their password to meet this security requirement.
Looks like two days of my life going to be spent replacing Apple batteries. I know two other gentlemen in line with me before 10:00 were still there, like me, after 1:00 and at least two of us had appointments.