Why are my batteries getting hot with the switch turned off?
I built a simple circuit with 2 AAs, a SPST slide switch, 1 red LED and a 47 ohm resistor. With the switch in the off position the batteries get hot to the touch. All the connections and solder points were wrapped with heat shrink tubing so nothing is touching that shouldn't be. When the switch it turned on, the LED lights the way it's supposed to. I assume it's a bad switch but wanted to get some other opinions.