Using positive output as ground.
Amazon.com : PetSafe 9 Volt Replacement Alkaline Battery - Compatible with PetSafe 9V Battery-Operated Products - PAC11-12067 : PetSafe : Pet Supplies
Voltage rail splitters and virtual grounds for batteries and PFCs - Power Electronic Tips
9v Battery Snap Connector
Simple LED circuit with 9V battery – helloCircuits!
What is Negative Voltage?
Virtual Ground Circuits
On a 9-volt battery, which terminal is positive? - Quora
power supply - GND of 9V batteries in a circuit - Electrical Engineering Stack Exchange
9-Volt Battery | Replacement for Genie Intellicode® Keypads – The Genie Company
On a 9-volt battery, which terminal is positive? - Quora
Replacement 9-volt Battery For In-ground Fence Collar
Wiring of arduino-breadboard-servo-9V battery - General Electronics - Arduino Forum
iPower 9V Lithium Polymer Rechargeable Battery 800 mAh - Trew Audio
9V Rechargeable Battery for Electric guitars
grounding - Dual Power Supply (Two 9V) - Electrical Engineering Stack Exchange
8V power supply
Virtual Grounds & Rail Splitting
Powering Arduino With a Battery (with Pictures) - Instructables
Electric Guitar Pickups Humbucker Active 9V battery power supply - AliExpress
9 V Battery | OMNICONTROLS
9 volts battery to +9V, Ground and -9V. Dual polarity. - YouTube
