How do I get to the battery of the 325i on 2005 BMW 325i

The existing battery in my 325i appears to have a dead cell. Where is the battery located and how do I get to it?

Asked by for the 2005 BMW 325i
It should be in the trunk on the right (passenger) side under a panel.

1 more answer
the battery is in the right side of the trunk. if you
have a battery module located on top of the battery, you
will need to have the battery installed by a BMW specialty shop.