An EP catheter includes a tubular body having a proximal region, a neck region, and a distal portion predisposed into a single shallow helical fixed-diameter loop configuration and including a plurality of diagnostic electrodes. The methods employ the monitoring of the placement of macros within circuit layouts for design rule compliance. A plurality of appliances are communicatively coupled to the bussing arrangement and adapted to receive and process one or more audio, video, and data signals. In one application, the methods and systems are used in connection with an electrochemical power source and components thereof.