I've been getting to grips with the Eagle Board Layout tool but I can't figure out how to make custom holes in the PCB so I can solder wires to a battery clip, do I do this in the Board Layout or is there a component I can use in the schematic and if so which one
1 - You can create a new component and design the pads how you want them
2 - Directly on the board you can add a pad. You might get a warning about overlapping but just approve it.