BMW 84102447710 Battery

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Always disconnect the cable from the negative battery terminal first and hook it up last to avoid shorting the battery. The negative cable connector of the battery has an Intelligent Battery Sensor (IBS), so do not pry under it or attach any other ground wires to the negative cable end. Some systems on the vehicle require battery power to be available at all times, such as the alarm system, power door locks, or to maintain control unit memory. When the battery is disconnected, the power that maintains these systems is cut. Therefore, remove the key from the ignition and keep it with you to avoid it getting locked inside. Devices known as "memory-savers" can be used to avoid some of these problems. The typical memory saver is plugged into the cigarette lighter and is connected to a spare battery. Then the vehicle battery can be disconnected from the electrical system. To disconnect the battery, loosen the cable end bolt and disconnect the cable from the negative battery terminal. Isolate the cable end to prevent accidental contact with the battery terminal. After reconnecting the battery, several of the vehicle's electronic control modules will require time to relearn certain values. This will normally be complete within a normal driving pattern of 15 miles. In addition, several systems may require re-initialization. For the sunroof, press the sunroof operating switch into the tilt position and hold it there. Once the sunroof has reached the fully tilted position, hold the switch in that position for approximately 20 seconds. Initialization is complete when the sunroof briefly lifts at the rear again. For electric windows, operate the button to fully close the window, then continue to hold the button for at least 1 second to normalize the auto stop function.

Lift the catch and remove the right-hand side trunk side trim.

Check the external condition of the battery for any damage or loose connections.