2006,Takes several times to start car

I bought my car yesterday used and had a mechanic from the website check it out. We saw that the battery was missing something to hold it down so it won't shift. I bought the car anyway because it really didn't have any problems. The only concern I have is can the battery be the cause of my car not starting until maybe the 2nd or 3rd try? It's a new battery and I would like to know before I take appropriate action.

My car has 94471 miles.
My car has an automatic transmission.