This is a very useful connector, on one end is a snap for the 9V battery, and on the other end is the standard DC jack (2.1mm). If you are using a 9V battery to power your Arduino board, this cable will be handy and perfect for you. The “centre pin” of the DC barrel plug is positive and the outer barrel is negative meaning it is compatible with Arduino’s DC barrel jack. The battery snaps into the connector and has 110mm wires – just long enough to give you flexibility in battery placement, but not so long that the wires take up all of your extra space in your enclosure!

• Custom-made to deliver power from 9V battery to DC socket (2.1mm)
• One end is a 2.1mm DC jack (centre positive) and another end is a snap for a 9V battery
• Cable length ~ 12cm
• Hard plastic I-type connector
• 5.5 x 2.1mm connector
• 15cm stripped and tinned leads,
• 1 red and 1 black for easy identification and soldering Snap-on terminal connector for 9-volt battery or for a DIY project