How long does it take an alternator to charge a dead car battery?

How long does it take an alternator to recharge a dead battery?

Basically, at idle you can probably get 80 amps out of your alternator. 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.

Will an alternator charge a dead battery?

A) Alternators are designed to maintain a battery’s charge, not to recharge a dead battery. Charging a dead battery with an alternator will result in premature alternator failure.

How long does it take to charge a car battery from dead to full?

Charging a regular car battery with a typical charge amp of around 4-8 amperes will take about 10-24 hours to charge it fully. To boost your battery enough to be able to start the engine, it would take around 2-4 hours. The best way to maintain a long life for your car battery is by recharging it slowly.

Why does my car battery died after sitting for a few days?

Some of the most common reasons for a car battery to die repeatedly include loose or corroded battery connections, persistent electrical drains, charging problems, constantly demanding more power than the alternator can provide, and even extreme weather.

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How long can a car sit with a dead battery?

According to BMW, the maximum time you can let your car sit with the battery intact is four weeks. This claim is supported by BatteryModeOn.com, who said the short answer to the question is “a little under two months.”

Is my battery dead or my alternator?

If the engine starts but dies immediately, your alternator probably isn’t keeping your battery charged. If a jump starts and keeps your car running, but the car can’t start again off of its own power, a dead battery is likely your answer.

How long does it take to jump start a dead battery?

The answer is it depends—per the instructions above, the range can go anywhere from a measly 2-minutes to as long as 10-minutes or even 30-minutes (in extreme cases). You may want to go over these troubleshoots not to waste your minutes: Is Your Battery “Cold”?

Does revving the engine charge the battery?

The battery will charge faster if you rev the engine faster. Why? Because the faster the crankshaft turns, the faster it turns the belt that runs the alternator. And the faster the alternator turns, the more electricity it produces to run all the electrical stuff in the car — and recharge the battery.

How often should you drive your car to keep the battery charged?

Keep the battery charged by driving your car once per week

For instance, a garaged, new car — with a brand-new battery, presumably — will fare better than an older car parked on the street. Keep in mind that batteries tend to drain faster in colder climates.

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Can a completely dead battery be recharged?

If a battery is completely dead but has been revived by a jump start, there are ways to fully recharge your battery. The first is, as mentioned, by driving around. … Keeping a car battery plugged in for twenty four hours can fully recharge your battery, and chargers are typically quite affordable.