9V Battery Snap Connector with Leads - Walmart.com
9V battery clip with 5.5mm/2.1mm plug : ID 80 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
Mating connector for 9 Volt battery
Amazon.com: 5pack 9v Battery Clip with 2.1mm X 5.5mm Male DC Plug for Arduino by Corpco : Electronics
Amazon.com: 9 V Battery Clip Connector, I-Type 9 Volt Battery Clip, 9V Battery Buckle Connector Hard Buckle Plastic Housing and Black Red Wires Leads Iength 5.9 inches (I Type Hard Shell 8PCS) :
Dual 9V Battery Connector (Parallel Wired)
9V battery clips to DC barrel | Prop Scenery Lights
Battery Connector, 9-volt
9 Volt Battery Connector | Buy Battery Snap & Micro Push-Button Switch for LED Lighting - Evan Designs