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The battery in the BMW 3 E90 is in the trunk on the right side, under the box. Starting to detach the terminals of the battery, it is necessary, as is usually done, from a cable (instead of to be installed from the plus-wire, it is necessary to install the terminals). When the battery is removed from the BMW 3 E90, it is important to remember one important nuance-the special fastenings that hold the plastic top cap on the battery are best kept with a long screwdriver.