I had the self level inactive warning before my alternator went.

Considering the fact that your battery died shortly after it wouldn't surprise me if your alternator wasn't charging properly. Get the car started and run the voltage test with the OBC.

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Current Bimmer
2004 X5 4.4i Sterling Grey Sport/Premium

Past Bimmers
1991 318I Alpine White
1995 740I Alpine White
1991 525I Schwartz
1998 323IS Scwartz
2004 330CI Cabrio Titanium Silver Metallic
1995 540I Schwartz
2000 Z4 3.0 Titanium Silver
2000 330ci Coupe Titanium Silver