Amps in Lawn Mower Battery

The most experienced lawn gurus will tell you that when you start your lawn care ventures, it’s often inevitable to face some problems. But with time and of course proper guidelines, you will no doubt get your fingers right when dealing with battery replacement and any other lawn mower battery issues. 

A lawn mower battery is a vital part of your lawn care equipment. The battery functions to provide the power to run your machine but how do you ensure that it is in good shape? The truth is that there are many factors that you need to put into consideration into making a good lawn mower battery.

For instance, when you need to buy a lawn mower battery or replace one, you’ll have to purchase a battery with the ideal Amp rating for your equipment. It’s not a one-fit-all case and to completely understand the topic, you’ll need more.

How Many Amps Are In A Lawn Mower Battery?

Lawn mowers vary and thus it’s vital to know how many Amps are in your lawn mower battery. Generally, a battery-powered lawn mower usually needs a 12 Amps engine. That is to say, the battery constantly delivers a 12 Amps current to the mower’s engine. However, considering that most lawn mowers use a 12-volt battery then the Amps rating can range from as low as 8 Amps to around 20 Amps. 

If you want to know the actual number of Amps in your lawn mower, it is important to check the lawn mower’s manual. Most manufacturers will detail the specific amperage required for lawn mowing equipment. The Amps rating varies in different batteries.

As such, determining how many Amps your battery requires is important especially when you are buying a new lawn mower.

Besides, this knowledge helps you in choosing the ideal charger for your machine – you don’t want to damage your battery with a charger that goes beyond the Amp rating.

What’s more, it is also important to ensure that the charger you get is compatible with your lawn mower. Typically, the higher the Amps in your battery, the more powerful your machine will be. 

How Do I Know How Many Amps My Battery Has?

Luckily, there are numerous ways in which you can determine the Amps of your lawn mower battery. First, you can check your lawn mower manufacturer’s guide.

On the other hand, you can also calculate the Amps your lawn mower battery needs by multiplying the amp rating by the voltage rating of your machine. 

How Many Amps Is A 12v Lawn Mower Battery?

A modern lawn mower with 12V typically has 12 Amps in its battery, but not necessarily. Simply put, the Amps in a 12V lawn mower can vary from 8 Amps to around 20 Amps.

Thus, it is vital to check your lawn mower manufacturer’s manual to find out the accurate amperage for your specific model.

How Long To Charge Lawn Mower Battery 2 Amp?

Typically, a regular car charger gives out around 4 amps -15 amps. On the other hand, 2 amps – 4 amps chargers are usually designed for battery maintenance in a lawn mower.

Charging your lawn mower battery at 2 Amps may take up to 24 hours.

How Long To Charge Lawn Mower Battery at 10 Amps?

If you are charging your lawn mower battery at 10 Amps, it will take from around 4 to 11 hours to fully charge the battery.

Consequently, since charging your lawn mower battery at 2 Amps may discharge at a greater rate than the charger can provide, it’s better to charge your battery at around 10 Amps. 

How Often Should I Charge My Lawn Mower Battery?

A lawn mower has alternators. So, if you are mowing regularly, you don’t need to worry about using a battery charger. However, battery chargers are crucial when winterizing or summarizing your lawn mower. Simply put, the mower’s battery charger is important when you are planning on storing your lawn care equipment.

This is because if you store your lawn mower’s battery without a full charge, crystals will accumulate on the battery’s plates reducing its ability to hold a charge. 

When charging your lawn mower charger, be cautious not to overcharge it especially if you are using a standard charger. Thanks to technology, most chargers come with battery maintenance built-in protection.

This helps protect your mower battery from overcharging. Therefore, you can connect your battery to a charger at any time it’s not in use.

Typically, a lawn mower battery needs charging for about 8 hours to 10 hours before the first use and just before storing it away for prolonged periods. 

Can You Start A Lawn Mower While Charging The Battery?

Yes, you certainly can start your mower while charging the battery. 

There are some lawn mower charger models that come with a “boost” setting. So, check whether your charger has such a setting. If yes, all you need to do is put the charger on boost and start your lawn mower.

However, if your charger doesn’t have the “boost” setting, you will have to wait for the battery to get enough charge to start the mower engine.

Moreover, if you have a 12V lawn mower, you can use the jumper cables to start it while still charging the battery. You’ll have to do this in the same way that you would when starting another car. 

Step 1: Hooke the positive red cable to the positive terminal of your lawn mower’s battery and the other to the car battery.

Step 2: Start the car, and then start your lawn mower

Step 3: Once the mower’s engine starts, you’ll need to carefully remove the jumper cables. Ensure that the cable clamps do not come into contact with each other until each clamp is removed.


When replacing the battery on your lawn mower, you’ll need to ensure that you get your fingers right in selecting one that is compatible. If your lawn mower gets too little power or too much power than it’s supposed to, it will wear out quickly.

Furthermore, you’ll have spent your precious dollars on waste. Thus, knowing the number of Amps in your lawn mower battery can save you a lot of hassle.


Victoria Peterson

I am a passionate gardener who wants to help you create and maintain your dream yard. I know that it can be daunting to take on a project like this, but I am here to help. I have been gardening for years and have learned a lot along the way. I want to share my knowledge with you and help you create the perfect yard for your home.

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