The battery in a BMW X5 is located under the spare tire in the center of the trunk. To find the battery, lift the carpet in the trunk, remove the spare tire, remove the three 13 mm support bracket fasteners and lift the support bracket.
If an owner needs to charge the battery, he or she can do so by using the junctions under the hood of the car, on the driver's side. The battery should be removed from the car before charging. The car battery emits a gas when it is being charged and this can fill the back of the car.