Most likely yes. If you remove a cable from the battery and put a test light in the gap, any light at all will show you your battery will run down during storage. Disconnecting batteries that are fully charged will keep them safe from freezing and they will be very close to the state of charge when they were disconnected. I've done it for years in boats and RVs with no issues.
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI