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Virginia Gentleman
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Not sure about that particular year, but the owner's manual for my '06 1500 indicates the battery should be disconnected if the vehicle is to be sitting for over 21 days:

VEHICLE STORAGE
If you are storing your vehicle for more than 21 days, we
recommend that you take the following steps to minimize
the drain on your vehicle’s battery:
• Disconnect the Ignition-Off Draw fuse (I.O.D.) fuse
located in the Integrated Power Module, located in the
engine compartment. The I.O.D. cavity includes a
snap-in retainer that allows the fuse to be disconnected,
without removing it from the fuse block.
• The electronic shift transfer case should be placed in
the 4HI mode and kept in this position to minimize the
battery drain.
• As an alternative to the above steps you may, disconnect
the negative cables from both batteries.


I realize the truck you are referring to may not have an IOD or electronic shift transfer case, but the disconnecting the negative cable would be the best suggestion - especially if it isn't driven that often and you know it won't be for an extended period of time. Clocks and alarms (if it has one) have small residual drains which over time can kill a battery if the vehicle is not run on a consistent basis. Vehicles need to be driven a on somewhat consistent basis.

I have left mine sit for up to 18 days without running it - we flew to my wife's parents for Christmas vacation a few years back. When we arrived home, I unlocked the truck and she fired right up.

I would suggest disconnecting the battery when it is known the vehicle won't be used for a long spell. Then put the battery on a trickle charge 24 hours before it is needed.
 
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