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The genset does not have an internal battery. It runs off the battery in the RV, usually the house battery. Rarely you will see it connected to the chassis battery.
The clicking sound you are hearing is a sign that the genset is not getting enough battery power to run the starter.
The first thing to do is to check your battery cables, both at the battery, and at the genset, and make sure all connections are clean and tight.
If the cables are not the problem, you need to take the battery in and have it load tested.