i want to replace my car battery. where is it? i cant find it? on 2004 BMW 325xi

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where is my battery i cant find it under the hood? can i remove battery myself? or do i need to take it in to macanics?
(4) Answers
Better off having a shop handle this and Sears auto centers, has napa autocare centers and some AAA tow services have a battery replacement service available