Breakdown #1 under
Join Date: Jan 2011
Location: United Kingdom
look, none of us are saying that you can and indeed SHOULD run a car without a battery, it's foolish to say the least..
It's like saying, my engine won't run, but i could get it half a mile down the street if i put it in gear, and used the starter motor to turn the wheels.
But the whole point is that the battery is there in the main, to give you the cranking amps to start the engine in the morning. Once the car is up and running, and the alternator is dumping out it's nominal 14 volts, the battery is charging, and the car is being run at the same time from the alternator.
Yes your quite right, when you turn lights/fans/etc etc on, your putting a greater electrical load on the system, and the battery takes up some of that slack before the alternator picks it back up again...but once a car is running, a battery is operating in more of a capacitor type capacity, than you thinking that electricity flows in, to then flow straight out again to the spark plugs etc etc rest of the car.
It's a parallel power system, not a serial one.
Either way, 'turning things on' in your car, ISN'T going to shorten the life of the battery, miscare and incorrect usage will. As well as extreme temperature changes.