To make things more understandable... What you need outside the picture...
Hook each battery to the positive and negative terminals... One battery to one monitor... just like mora...
Then, assuming you are using more than one in a stack hook the enable pins of all boards to one switch and supply that with +12V (from you aux battery or such)... That switch now switches all the monitors on or off... (The drain on the aux battery is somewhere around .02 mA per monitor or so, so not really noticable) and once off it's disconnected from all batteries so no parasitic drains...
The Mode connector can either not be used and then you solder (or not) the internal jumper to set the bar/dot mode permanently... Or you hook this to a switch with +12V and you can now select mode as well...