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There are a few variables to take into account here. The discharged state of the battery and the current produced by the battery charger on the slow charge position are two of the most important. The amp/hour size of the battery is another governing factor.

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Q: How long does a 12 volt automotive charger set to slow charge take to charge a battery?
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2 hours i heard on youtube


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Can you use a 3.5 amp charger to charge a 12 volt battery?

You can charge a 12 volt battery with a 6 AMP charger. The amount of amps put out by the charger is actually the rate which the power flows out from the charger, not the amount of volts it will charge. Volts and Amps are two different things. You can't charge up a 12 volt battery all the way, using a 6 volt charger. You can charge a 12 volt battery with a 12 volt charger rated at '6 amps'. It will charge the battery faster than a 2 amp charger will, but it will take longer than using a 12 amp charger. You probably don't want to use anything higher than a 12-16 amp charger for charging a 12 volt battery. Some chargers are equipped with a 60amp boost charge that is used for starting the vehicle, without having much of a charge in the battery. You DO NOT want to attempt charging a battery with it set to a 60amp boost charge. That is for starting vehicles only and could damage your battery. Keep in mind that the lower the amps are, that you use to charge the battery (1-2amps), will result in the charge lasting longer without recharging it, than if it was charged up at a higher setting (12-16amps).

Related questions

How long do you need to charge your car battery using an automatic battery charger?

If it is an automatic charger let it charge until the charger shuts off.


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A trickle charger is a car battery charger that is designed to be left on a car for very long periods of time to re-charge that car battery by slowly adding charge to the battery.


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How long to charge a 12 volt battery on slow charge with a 30 amp charger?

I doubt the charger is putting out 30 Amps on a slow charge. need more info on battery and charger.


How long do you charge a 9.6 volt 2000 mAh battery?

With a charger specifically designed to charge this battery.


Can you use any car battery charger to charge a battery from an automatic car?

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As long as it is a 12 volt battery you can if you set the charger on low.


How long does a0.6 amp charger take to charge a 12 volt battery?

A .6 amp charger is a trickle charger. It would take days to charge a dead 12 volt battery with this charger. You need a 10 amp charger which will charge it in a couple of hours.


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This depends on what kind or charger are you asking about and what kind of battery are you charging. My Phone charger takes two hours to charge my phone.