When storing your RV or pop up remember to disconnect the leads from the battery, if you have one, there are things like propane leak detectors, etc. that will drain your battery (if left connected). Your battery will discharge during storage regardless so make sure you charge it in some fashion if you let it sit for and extended period of time.
You can check your battery with a multimeter...set it to VDC (Volts DC) and 20 (if it is not autoranging - car, marine and deep cycle batteries are usually 12 volt). Place the black lead on the - terminal and the red lead on the +. The battery should be around 12.6 volts.
...that is all.
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