Panasonic DMC-GH4 owner manual Grip, you can set that which battery should be used first

	Others
[Headphone Volume]	Adjust the volume of the connected headphone set (commercially
	available) in 16 steps.
[Live View Mode]	Set the frame rate of the recording screen (Live View screen).
[Monitor Display]/	Brightness, color, or red or blue tint of the Monitor/viewfinder is
[Viewfinder]	adjusted.
[Monitor Luminance]	Set the monitor brightness to suit the amount of surrounding light.
[Economy]	Suppresses the unit’s power consumption to prevent the battery
	from being run down.
[Battery Use Priority]	When batteries are inserted to both this unit and the battery
	grip, you can set that which battery should be used first.
[USB Mode]	Sets the communication method when connecting using the USB
	connection cable (supplied).
[TV Connection]	This sets how the unit connects to a television etc.
[Menu Resume]	Stores the location of the last-used menu item for each menu.
[Menu Background]	Set the background color for the menu screen.
[Menu Information]	Descriptions of menu items or their settings are displayed on the
	menu screen.
[Language]	Set the language displayed on the screen.
[Version Disp.]	This enables the firmware versions of the camera and lens to be
	checked.
[Exposure Comp. Reset]	An exposure value can be reset when the Recording Mode is
	changed or the camera is turned off.
[No.Reset]	Returns the image file number to 0001.
[Reset]	The recording or setup/custom settings are reset to the default.
[Reset Wi-Fi Settings]	Reset all settings in the [Wi-Fi] menu to factory default settings.
	(Excluding [LUMIX CLUB])
[System Frequency]	Changes the system frequency of motion pictures you record with
	and play back on the camera.
[Pixel Refresh]	It will perform optimization of imaging device and image processing.
[Sensor Cleaning]	Dust reduction to blow off the debris and dust that have affixed to
	the front of the imaging device is performed.
[Format]	The card is formatted.

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