I want to replace the starter battery. I don't know how to remove these covers-any help out there?

Without any pictures I'm not 100% sure what you are talking about but looking at pictures of Roomster engine bays online I think it's similar to our Citigo... If you undo the positive terminal to the battery the fuses and plastic boxes on top that are fixed to the terminal should come away with it. They are, however, clipped to the side of the battery so you'll need to pull them up whilst releasing the clips by pulling the centre section outwards away from the side of the battery.