I have a Arduino Uno board and the two metal cylinders near the power jack are becoming extremely hot very quickly when I attach a 9V battery for power the nine volt battery is also completely depleted after about 2 minutes. Connected to the Arduino I have 3 mechanical relays (to 3 different pins), each requiring 80 mA to switch, I believe that 80 mA to be the culprit but I'm not 100% sure. Also connected to the Arduino are a MPU-6050 and a MCP-4725. The MCP-4725 is connected to a brushless motor controller, which is connected to a 36V power supply.
If anyone can help with the overheating problem that would be great,