How to Remove a 2007 BMW 325i Battery

1. Pull back the carpet on the right side of the trunk to expose the plastic lid.
2. Remove the two bolts that secure the front of the lid to the floor of the trunk with a large Phillips screwdriver or a 12 mm socket and ratchet.
3. Pull up on the lid. This can be a bit difficult, because the edges of the lid rest below the carpet surrounding it. You will not damage the cover if you pull upward on it hard.
4. Remove the negative and positive cable connectors from the battery with an adjustable wrench.
5. Lift the battery out of the battery box and place the new battery into the box.