Disconnecting the battery requires a dealer visit to register the battery when reconnecting.
Maybe you could start it after 4 weeks and top off the charge?
"sometimes you're the windshield .... sometimes you're the bug"
2014 328i Mojave Metallic
2009 328i Black Sapphire Metallic
2007 328i Black Sapphire Metallic
2007 Honda S2000 Berlina Black
(Hey Jim... am I diversified?)