Plastic Male DC Power to 9V Battery Clip Connector Cable 2.1 x 5.5mm 6 Pcs | eBay
9V battery clip with 5.5mm/2.1mm plug - Melopero Electronics
9V battery clip with 5.5mm/2.1mm plug : ID 80 : $2.95 : Adafruit Industries, Unique & fun DIY electronics and kits
9V battery clip with 5.5mm/2.1mm plug | Adafruit ADA80 | Core Electronics Australia
9V PP3 Battery Clip Lead to 2.1mm DC Connector – ETC Educational Technology Connection (HK) Ltd
Chanzon 9v Battery Clip with 2.1x5.5mm Female DC Connector I-Type Plastic Holder and UL Wire Pack of 5pcs kit for Arduino,LED Strip: Amazon.co.uk: Electronics & Photo