To change a device’s settings go to the device blueprint so for example the BP_CarBattery and select the BP_MasterPowerComponent in the Components panel, then in the Details panel find the Power Settings category and in that category you will find the UI settings.

Here you can change this device’s UI settings, you can hover your mouse over each settings name to get a tooltip with more info about each setting.
Icon – This is the icon in the power info widget used when the player looks at a device.
Name – This is the name used in the power info widget used when the player looks at a device.
Show Battery Output UI – This turns on/off the battery output UI in the power info widget when the player looks at a device, if the devices Max Battery Power is 0 this will always be hidden.
Show Battery Input UI – This turns on/off the battery input UI in the power info widget when the player looks at a device, if the devices Max Battery Power is 0 this will always be hidden.