Onan 6.5RV 3CR-16020P Generator Battery charging?

Does the 6.5 RV 3CR-16020P have a built in Battery Charger? The reason I am asking is that if I disconnect the battery the generator shuts off. My Kohler Generator only needs the battery to start and will run fine without it.

Also is there a procedure to check / adjust the choke? My choke has a wire to it so I assume it is electric and it also has a manual lever you can move. It never moves on its own it is always about 1/4 on.