Wow that's awesome, very detailed. OK I did everything you said. When I hooked up all the lights without a toggle switch, no problems, no heat. When I introduced the switch, the batteries get hot. I went to Radio shack and got another switch and still the same problem. I am lost I need help. I do have everything hooked up in a parallel circuit. I have both the power and the ground going to the switch and the lights turn on and off, but get hot. The circuit seems like the circle you were explaining. The lights are 5mm, 3.6V. The lights do not get hot or burnout. What happens when I turn the lights off, the batteries get very hot, then if I wait about two mintues and try to turn the lights on, they are very dim and sometimes don't even work. Probably because the batteries are so hot.