Noka is correct. There are terminals under the hood for the specific purpose of jumpstarting your X3. In the US '13 owner's manual the location is described on page 245 in the section called Engine Compartment. In the attached photo, copied from the manual, #3 is the Negative Terminal and #4 is the Positive Terminal. Again, this is from the 2013 US manual. The location of the jumpstarting terminals may be different for other model years and/or in other countries.
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