Making the right adjustments here can help improve frame rate when the simulator runs on settings that require very much of your computers hardware. The battery will only be considered if more amperage is needed by the electronics than is available from the Dynamo which may occur in a generator error or when taxiing in any aircraft. In addition you can set the status to visible or invisible by clicking the eye icon to the left of it and you can set it to locked or unlocked i.e. fixed or movable by clicking the lock icon. To set the RPM manually with the idle halfway and maximum delivery lever select this box and then adjust the values in the three additional fields that are displayed. All other charities such as external fuel tanks do not receive such special dialog boxes. Instead they are modeled in the various organs dialog as described in the section adding other organs in the fuselage.Making appropriate adjustments here can help improve the frame rate when the simulator is running at settings that are very demanding on the computers hardware.The battery will only be considered if more amperage is required by your electronics than is available from the generator as might occur in a generator failure or when taxiing in some aircraft.Additionally you can set its status to visible or invisible by clicking the eye icon to the left of it and you can set it to locked or unlocked that is unmovable or movable by clicking the padlock icon.To manually set the RPM with the power lever at idle partway and maximum check this box and then adjust the values in the three additional fields that appear.All other extra bodies like external fuel tanks get no such special dialog boxes instead they are modeled in the Miscellaneous Bodies dialog box described in the section Adding Other Bodies to the Fuselage.