If your battery went dead in two weeks, either your driving distances are not enough to keep it fully charged or it is weak/dying and won't hold a charge. So I agree with the posts above - replace the battery with a good one. Make sure it is fully charged and then perhaps the X will come back to life.

If your drive is long enough to charge the battery (so it should have been fully charged two weeks ago), then completely charge your battery and test the alternator as well as the battery's ability to hold its charge. You also might have an excessive drain somewhere, which will be fun to trace but necessary to prevent recurring - if both the battery and alternator are good.

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Mike

2005 e53 X5 4.8is 169k miles
2018 f90 M5
2018 Volvo XC60