Your unit shouldn't be pulling any amps when its off. Maybe try disconnecting power cable from back of your unit and ohm out the positive and negative wire to see if there is a short within that cable. In my college computer electronic training, we learned about something called a "crowbar circuit." Crowbar circuit protects computer chips from becoming fried when there is a short or too much voltage is applied. Not sure if Elite 5x uses this circuit or not. What this circuit does is direct excess voltage to ground instead of thru voltage sensitive chips. When this happens it should blow main fuse on power wire, but I have experienced that if too much voltage is applied; the diode in this circuit can burn up and continue to allow power to drain thru ground.
Always best to recharge your battery immediately after each use and to disconnect power wires. I like have voltage overlay data displayed on the fishfinder screen to watch battery level when fishing. Also, having display light on high draws battery power. Hope this info helps you!
