This battery holder can hold 6 AA battery which can make 9V battery pack from alkaline cells.
It comes with a DC2.1 Powerjack which can plug to Arduino directly.
Specifications
Cell Quantity: 6
Battery type: AA
Storage temperature: 25'C (77F, RoomTemperature)
Max Operate temperature: 80'C (176F)
Package includes:
1PCS 6XAA 6xAA 6*AA 9V Battery Holder Box Case Wire DC 5.5*2.1mm Plug NEW