I see several re-posts of possible issues after the O/P said it was fixed.
And to the O/P.. Terminal or Lug or Connector all fit the description of what you described
Terminal is usually used to describe the battery post but to be honest it is anything that is at the end of something (End of the plates on teh battery, or in this case end of a wire)
I have seen that described (on a box of them in my spares cabinet) as {size} Ring terminals, also as lugs.
They are also described as connectors since they connect.
Several terms. all apply equally.