Today the whole day my 2IS has been having start-up problems. It seems like the batteries were low but checked it and they are charged. Upon pressing on it turns but very weakly. No clicking or rattling sound and pepboys said my batts were good. What is the problem? It's not even intermittent too. Alternator?

 

Sounds like it could be the starter. That is what happened to a friend of mine Z4, and it was diagnosed by BMW.

 

look into your battery . That was a sign of my battery dying when my car was doing this two months ago .

 

Sounds like the battery to me too. (NOT BATTERIES) How old is your current battery?

 

even if the battery shows ok, if its 3+ years old it could be ready to go --- so its something that you probably need anyway...its worth a shot and pretty cheap too.