How much mAh does a standard car battery have? 

 September 19, 2021

By  Phil Borges

One of the things to look out for when buying car batteries is how many amp-hours it has. Of course, it's probably not something that's on the forefront of your mind - but if you're looking for a new set of an alternator belt and want to make sure it's compatible with your current battery, knowing what kind of charge is in there can help. 

How much mAh does a standard car battery have?

There are different types of batteries, and the capacity depends mainly on the size. Smaller 12-volt lead-acid batteries usually contain around 20 to 50 amp hours (mAH). But you'll find that truck or marine batteries may hold up to 400 amp-hours.

The battery is one of the very important features of a car, but how much do you know about it? Let's take a look at your standard car battery. An average car battery with 12v lead-acid type has an amperage capacity somewhere between 50 and 200 amps. The higher the amp number, the more powerful your battery will be in terms of starting up your engine or powering electrical systems such as headlights and radios for long periods.

How to find out how much mAh does your standard automotive battery have?

In order to find out how much mAh does your average automotive battery has, you need to know the size of your battery. You should also consider what it will take for your vehicle's demands and needs. Some vehicles, such as sports cars, are demanding on batteries due to their high power consumption while idle or running at full speed. This is why you should always have an extra battery on hand.

How to calculate the mAh of your car battery?

You can calculate the milliamp hours of your battery by multiplying the number of cells in series times 2 volts each. For example, 6 cells x 2 volts per cell equals 12 milliamp-hours (mAh). A battery typically consists of six individual cells and has a capacity to produce 12 mAh for this example.

Note: It is important to keep tabs on how much mAh is being produced before deciding to replace a battery in order to avoid any instances of draining too low too quickly.


In order to avoid the frustration of having a dead battery, it's important to know how much mAh your car battery has. This little bit of knowledge can save you from being stuck in an inconvenient situation and will help prevent any instances of draining too low too quickly. If you're unsure what milliamp-hours (mAh) means, remember that if there are six cells per battery, multiplying 2 volts by 6 equals 12 milliamp hours. These tips should come in handy, so make sure to share them with your friends!

Car batteries are designed to allow a high current in one quick burst, so the car starts, with other features being a secondary goal. When choosing a car battery, engineers and designers typically specify both CCA ('Cold Cranking Amps') as well as mAh ratings.

About the author

Hi, I'm Phil Borges.. thanks for reading.. My wife says I can't shut up about batteries so to save my marriage I've started this blog .. where I'd be ranting about batteries! Please leave a comment if you have any questions, I'm happy to help!

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