By Erik Watkins

How Many AMPs To Charge A 12 VCar Battery?

Last updated: May 11, 2023
How Many Amps To Charge A Car Battery

Charging car batteries seems quite simple, right? Simply charge with any amp and connect it to your vehicle battery. What is likely to happen?

Though the connection between a charger and an automobile looks relatively easy, there are some points that you need to bear in mind. That indeed allows you to maximize your battery’s potential lifespan when it isn’t damaged during the process of charging.

With too many amp hours, you will meet the risk of explosion or fire. But too few amps can make the battery get interrupted charging.

How Many AMPs To Charge A Car Battery

The common answer is a range of 4 to 7.5 amps. This fluctuation allows your battery to stay most efficient and safest. Your equipment will avoid the risk of overcharging and reach the maximum volume of power with the least damage to the component. 

If you use voltages to measure this standard, the minimum voltage 12-volt battery could be safely charged.

Yet, at this volt, the charge capacity of a vehicle battery is pretty slow. In order to push the charge rate higher, it will require at least 12.9 volts. An automobile battery could be charged effectively at high voltages as long as this battery isn’t fully charged. 

So the vehicle charger voltages and alternator voltages could get over 15 volts safely, given that this battery is managed to ensure that it is not overcharged. The higher voltages permit your power to be plenished faster. Still, if you need to leave the battery on this charger to put it in jam-packed condition, you can consider 13.6 volts to 13.8 volts. 

FAQs About How Many Amps To Charge Car Battery

What Is A 12v Automobile Battery Voltage Range When It’s Discharging And Charging? 

Vehicle battery voltage would vary, subject to its situation. Once the motor is switched off, an open circuit volt is almost 13 voltages. A newly charged battery, either by the charger or alternator, could estimate higher volts than that by building up a chemical-free charge on some panels like one capacitor. 

Thus, it could leave a little or be discharged for a while to reach that voltage. When this battery releases its power, the voltages will come down to 10 volts or even lower. In case this battery keeps over 11.8 volts, it would normally still generate enough power to crank up the automobile.

You might also like: How Long Does It Take To Charge A Car Battery

Should You Add More Water To A Battery After Or Before You Charge It?

You should add more water before charging a battery. The process of charging will build bubbles which aid in mixing the acid. Even with a totally out-of-control battery charger, this process won’t consume much more water within a charge. 

Also, we should mention that the latest charging network with precise voltage regulations won’t consume any considerable water, and this sealed battery reuses the water, so you cannot replace it.

Selecting Battery Charge Amperage

In A Nutshell

By and large, the charging rate for 12v car battery is the most popular choice, yet in order to push the rate faster, you should set it at 13.6 – 13.8 volts. 

From now on, don’t forget to scan some signs on the battery’s label to get full info for your equipment. That step is also a wise way to effectively lengthen the component’s lifespan.

Now, it’s time to say thank you for accompanying and seeing you in helpful coming blogs.

Automotive Mechanic at PowerAll

With 7 years experience in management positions leading automotive mechanics at PowerAll, Erik Watkins wishes to share useful knowledge and information about automotive mechanical equipment.


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