Adding an 8v power output to my Power mount hub

I am in the process of adding an 8v power socket to my power mount hub, shown below, this will enable me to power my Canon 1000D from the hub, so i can take out the battery and have less heat moving around in the camera.
I will be removing the insides from an old battery and just connecting a wire to the contacts in the battery, this wire will then be plugged into the 8v power socket...pictures to follow of the project when complete.