9V battery clip with 5.5mm/2.1mm plug : ID 80 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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2 Pcs 9 Volt Battery Clip Connector I Type Hard Shell Buckle Holder 15cm Wire - Walmart.com
9 Volt Battery Connector to DC 2.1 x 5.5mm Plug, 4 Inch 26awg wire
EP-0249-000 Pack of 5 9V Battery Terminals — Allparts Music
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) :
DC 9 Volt 9V SNAP ON BATTERY CLIP CONNECTOR I Type (i) Choose Quantity 1-20 pcs | eBay