My car battery is dead. Unfortunately, being the obstinate person that I am, I tried over a dozen times to turn the key in the ignition, simply resulting in “dead battery sounds.”
I’m going to jump start it, but did I do anything dangerous to the battery by trying to start it the normal way repeatedly? Are there now any hazards in jump starting the battery after I metaphorically beat the dead horse?
No. When you complete the circuit and the battery is dead, very little current flows, so nothing much happens. You’re going to stress the battery much more when you jump-start the car, because large currents will flow. Nevertheless, lead-acid batteries are generally much more robust than the batteries in consumer electronics, and this kind of abuse generally won’t faze them.
it depends on how deeply you ran it flat. when you discharge a lead-acid battery, a layer of lead sulfate starts building up on the plates. discharge it too deeply, the layer can get thick enough to both damage the plates, and be enough of a barrier to conduction where you won’t be able to charge the battery much if at all.
It might depend on how you went about your dozen attempts were done and of course how dead the battery actually was.
If you turned the ignition key fully off each time you tried and the battery had enough energy to run the fuel pump each time you could flood t e engine and that could also lead to fuel in the oil.
And of course this jumping often is going to take a toll on your alternator.
Attempting to start a car that won’t turn over at all certainly won’t flood it. The fuel pump only builds pressure; the injectors won’t actually open until the engine is turning. Trying to start a car with a weak battery could theoretically flood the engine if you’re getting weak spark, but usually it’ll go from weak cranking to no cranking before flooding becomes an issue.
You probably didn’t, but, you can damage your starter by trying to start your car with a “dead” battery. When the voltage drops because of a dead battery, the current flow will increase, which can burn the windings in the starter. See Ohms law.
What kind of sounds? To me “dead battery sounds” usually means the clickclickclickclickclick noise which is the solenoid trying to engage the starter but failing. So in that case, the engine isn’t actually being turned and so the injectors aren’t firing.
The situation I was describing is if the engine is cranking over like normal, just much slower and unevenly. But that usually happens when the battery is just barely on the cusp of being too dead to turn the engine over and so after a try or two either the car will start or the battery won’t even be able to do even that and you get the clickclickclickclickclick.
The flooding situation is incredibly unlikely (on a modern car at least) so don’t worry about it.