How Long to Charge a Car Battery

September 21, 2021
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A car battery has 48 amps, so depending on how many amps your charger has, divide 48 by the charging rate and that is how many hours it takes. For example if your charger charges at 6 amps an hour, 48/6=8, so it will take 8 hours to fully charge a battery.


But before you throw a charger on it, let's see if your battery is worth saving.


First, if your battery is at least 3 years old it may be worth replacing as most batteries last about 4 years.

 

Also consider that if your battery is fully dead, it will be permanently damaged and can potentially strand you again.


Car Batteries in Cold Weather

Your climate also affects battery health. Extreme weather is particularly harsh on batteries. So if you live somewhere that regularly sees freezing temperatures or triple digits, your battery already has a shortened lifespan. 


This happens due to the summer heat causing fluids in your battery to evaporate, reducing its effectiveness. However this usually isn't a problem until winter comes and fluids thicken, requiring more energy from your car battery to get it started.


My Battery is Still Good

If you've decided your battery still has some service left in it, here is how long it takes each charger to get your battery up to full health.


It's important to note, that if your battery is completely dead, a slower charger is a healthier way to charge it. If you charge it too fast (anything more powerful than 16 volts) you can damage your battery.


If you don't want to do any math, we did it for you below. 


How long does it take to charge a battery at 2 amps?

It takes 24 hours to fully charge a 48 amp battery at 2 amps. A battery has around 48 amps, so divide 48 by 2 and you arrive at 24 hours. 


How long does it take to charge a battery at 6 amps?

To fully charge a battery at 6 amps it takes 8 hours. 


How long does it take to charge a battery at 8 amps?

To fully charge a battery at 8 amps it takes 6 hours. 


How long does it take to charge a battery at 10 amps?

To fully charge a battery at 10 amps it takes almost 5 hours.


How long does it take to charge a battery at 20 amps?

Before you charge a car battery at 20 amps, if it's dead this can potentially damage the battery. But to fully charge a battery at 20 amps it takes 2 and a half hours.


How long does it take to charge a battery at 50 amps?

Before you charge a car battery at 50 amps, if it's dead this can potentially damage the battery. But to fully charge a battery at 50 amps it takes 1 hour.


How long does it take to charge a battery while driving?

When driving at full speed it should take about 1 hour to fully charge the battery. If you need some help diagnosing a battery, reach out to us here and schedule an appointment.


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