Additional supplemental information. The old advice was to disconnect the battery during storage. With modern computerized cars this is bad advice, see this link. I also vote for the battery tender.
And, if this car will be sitting undriven for 4 months, you might want to add a bottle of fuel stabilizer to your gas tank, and drive it a bit to get the stabilizer all the way to the engine before parking it. I have read that current gasoline blends containing ethanol deteriorate faster than gasoline without ethanol.