Is Negative on a battery ground?

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hello

i working on circuit 18v battery stepping down 12v go small controller. 12v regulator has input, output, , ground. planning on passing regulator's ground negative terminal of battery, pretty straight forward. i'm passing vout controller , controller has ground can pass controller's ground batteries negative terminal well? wish had better way illustrate this.


                 (gnd)controller(+)---12v----(out)regulator(in)----(+)battery (18v)(-)
                     l                                                              (gnd)                                                             l
                     l                                                                  l                                                                  l
                      ----------------------------------------------------------------------

all grounds need tied together..

it's potential difference between 2 voltage sources.


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