Most owners manual says:
"If you are leaving your vehicle dormant for more than 21 days you may want to take steps to protect your battery. You may:
• Disconnect the negative cable from the battery.
• Anytime you store your vehicle, or keep it out of service (i.e. vacation) for two weeks or more, run the air conditioning system at idle for about five minutes in the fresh air and high blower setting. This will ensure adequate system lubrication to minimize the possibility of compressor damage when the system is started again."
This is a different type of battery than used years ago, it can be damaged by some trickle chargers. It has low inherent discharge rate, but the Jeep is alway drawing some current, hence the suggestion to disconnect the battery. There may a service/storage/ship mode somewhere in the settings that does the same thing.
When left unattended for more than a week, sometimes the parking brakeshoe will fuse itself to the hub. You may want to park without the parking brake set or be prepared to rock the Jeep back and forth to break it loose..
2011 Grand Cherokee Overland V8, 2009 Liberty Rocky Mt V6, 2000 Grand Cherokee Laredo I6, 1979 CJ7 I6 Quadratrac