Disconnect battery when parked?

Murray said

On an old car, when the ignition switch is turned off, then everything is really turned off. There is no draw on the battery- things are OFF! New cars are different. With multiple computers and loads of sensors and electrical stuff there is always something ON, maybe on a reduced level but still ON! This is why battery life on new cars is reduced.

Click to expand...

I don't think that is 100% true. If what you are saying then how would one turn on the four way flashers, lock the car on the side of the road and proceed to get help if say you ran out of gas ?? The interior light, horn, cigarette lighter, headlight and possibly a few other accessories will operate without the key in the ignition. So to answer the OP's question, it's not a bad practice to have a quick disconnect switch and to use it. Just my thoughts.