9V battery clip with 5.5mm/2.1mm plug : ID 80 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
9V Battery Connector
9 Volt Battery Terminal Clip - T Type Soft Faux Leather Backing – GuitarRepairParts.com
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On a 9-volt battery, which terminal is positive? - Quora
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Amazon.com: TJIUSI 9V Battery Clip Connector 5-Pack & Rocker Switch AC 6A/250V 10A/125V 2 Solder Lug On/Off Mini Boat Rocker Switch 5Pcs 2 Pin Position Snap with 10Pcs Terminals(Blue) : Baby
Allparts 9-volt Battery Terminal : Target
1604-31 9V Battery Connector
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Amazon.com: 9V Battery Connector,10 PCS T-Type 9 Volt Battery Buckle Connector Hard Buckle Plastic Shell Used in Student Experiment,or Other Equipment with 9V Battery(T-Type, 10PCS) : Electronics
20PCS DC 9V Battery Connector Snap Clip Holder 9 Volt I T Type Arduino Wire Cord | eBay