9V battery clip with 5.5mm/2.1mm plug : ID 80 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
9V Battery Connector with Plug
AllParts Metal 9V Battery Clip Individual
Amazon.com: SDTC Tech 5pcs T Type 9V Battery Clip Connector Positive Negative Snap Lead Wire(15cm) : Electronics
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9v Battery Clip - Vinyl
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) :
9V BATTERY CLIP, FLAT ORIENTATION | All Electronics Corp.
9V Battery Connector with Plug
Amazon.com: 5pack 9v Battery Clip with 2.1mm X 5.5mm Male DC Plug for Arduino by Corpco : Electronics
Amazon.com: Trenro 10 Pack 9V Battery Clip Connector, I Type Faux Leather Long Cable Housing, Black : Electronics
5PCS T type 9V Battery Snap Connector clip Lead Wires holder Line length 15CM