Can someone please confirm the location of the battery? I haven't see the car yet but my friend suspects that he might need a new battery. I don't know where it is and I don't want tolook like a fool when I stop by. Thanks!

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1995 E420 152k
1991 300D 2.5 348116 daily driver
1992 300E 2.6 196k-work in progress(head gasket)
2002 BMW 745Li 93k