Will anything negative happen if my battery post was upside down on the battery for a while?

 

You need to explain the question a little better. How can the battery post be upside down?

 

I'm sorry, the battery terminal end was upside down.

 

The battery post and the terminals have a slight taper to them to facilitate a tight fit. Having one of the terminals placed upside down on the post for a short time will not damage anything, as long as positive was connected to positive and negative was connected to negative.