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You can charge a flat battery to 80 percent full in about 2 hours, so long as you alternator can manage produce around 14 volts at the battery terminals this whole time. Basically, at idle you can probably get 80 amps out of your alternator. As long as you are able to get your engine started and your alternator is functioning properly your car battery should still charge in neutral.
Take a voltage reading across the main vehicle battery 4. But to make this possible, the alternator has to manage 14 volts at the battery terminals, the whole time it is being charged. It will likely charge at 8-10 amps for at least 24 hours. Also, if the battery itself is bad, an alternator in working order won't be able to charge it. The alternator is comprised of a voltage regulator and three main components: The stator, rotor, and diode. Yes, the alternator does charge the battery while the car is idling - regardless of the load on the battery. You need to trickle charge the battery to replace the energy lost. When diagnosing battery trouble, you must check the alternator to see if it is charging correctly. A bad alternator will not properly charge the battery. In fact, the alternator likely saw added stress over the last year, as it struggled to maintain voltage in a battery moving closer to being replaced.
Alternator. If your reading is closer to 12.5-13.5V then it’s likely that you have a smart alternator.
When the battery initially powers the car, the alternator belt, or V-belt, spins the pulley on the alternator, causing the rotor inside the alternator to spin very quickly. While there’s no risk of damage to the battery, however, the likelihood of shocks and sparks does go up when the battery is still in the vehicle. It is also important for people to realize that cars are not meant to be kept idle. *a bit* = not precise whatsoever, but let's say reading at 12.1 to 12.3V at the battery terminals, ignition off. You can charge a flat battery to 80 percent full in about 2 hours , so long as you alternator can manage produce around 14 volts at the battery terminals this whole time.
Very general rule of thumb: figure on 30 minutes of higher-RPM (highway, constant RPM) driving to top up a car battery that is a bit low. 40 minutes is 0.66 hours. Basically, at idle you can probably get 80 amps out of your alternator. In fact, if you run too many appliances, you may find that your battery doesn’t receive enough power to charge at all.
To fully charge a nearly dead battery could take a very long drive with everything electrical turned off and as stated above, could result in a near-useless surface charge (and/or a dead alternator). If the alternator is not working right, the battery slowly drains down.
How long does it take for the alternator to charge the battery?
An alternator needs at least 12-volts and at least 2-amps to create an electromagnet field. Most people will know that your car battery will charge while you have your car …