To be completely honest, I know so few about the 2005 BMW's, but the battery location should be simple.
Typically they are located under the hood, usually by one one ofthe hood hinges. However, BMW has been know to put some of them in thetrunk (
E46 325i). I have also seen some of them below the rear seat as well (Serie 3). Thebattery may have a cover over it, so it may be a little harder to see.
From my BMW catalog it shows it should be in the trunk, on the passenger's side. See this site:
BMW SelectHope helped with this (remember rated this help) Good luck.
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