How To Charge A Generator Battery

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To charge a generator battery you need to turn the generator on or charge the battery with a separate charger.

Find out how to charge a generator battery in detail so you can get the most out of your electric and remote start models.

How to charge a generator battery at home

Take these steps to charge a dead generator battery at home:

  1. Make sure the battery is properly connected to the generator
  2. Plug the generator battery charger into an outlet at home
  3. Plug the other end of the charger into the right generator port
  4. Wait 6 to 12 hours and potentially longer
  5. Test the generator to see whether the battery is charged

You also want to know that many generators will charge their battery while running. That means starting up the machine as usual but with recoil start can do the job too.

Additionally, it is important to note that not all generators come with a battery charger and compatible port.

In these cases, you will need to run the generator regularly or invest in a 12V battery (trickle) charger.

Make sure you safely disconnect the 12V battery. Don’t touch both battery posts at the same time and follow other necessary safety guidelines.

Ways to charge a generator battery at home without power

Some ways you can charge a dead generator at home without utility power include:

  • Starting your vehicle and using the battery if you can safely do this without overloading the generator battery
  • Other batteries you may have at home
  • Another smaller recoil start generator
  • Solar panels

Your situation and budget will influence which of these generator battery charging options is the best.

How long does it take to charge a dead generator battery?

It typically takes around 6 to 12 hours to charge a dead generator battery to sufficient levels.

However, exceptions like Generac mention their bigger generator batteries need to be charged up to 24 hours every 3 months.

Battery chargers often have a way to show when it is charged.

Does a generator charge its own battery?

No, generators do not always charge their own battery.

It is true that many generators do charge their own batteries. However, some require you to plug the battery charger into a working outlet.

This includes the generator outlets themselves after you get the generator running with the recoil cord.

How does a generator charge its battery?

A generator charges its battery by using part of the electricity it produces and converting it into the right format.

You can also plug a battery charger into the outlet of the generator itself. You do need a way to start the generator for this.

How do you keep a generator battery charged when not used?

You keep a generator battery charged when it is not used with either a trickle charger, included battery charger, or regular 12V battery charger.

Starting the generator up a few times a year can also keep the battery charged if you have a model that does this itself.

This also allows you to check whether your generator runs as desired and perform maintenance so you stay prepared for power outages.


What is the best way to charge a generator battery?

The best way to charge a generator battery is the main method specified in the manual.

This will often be starting the generator or plugging in a separate battery charger into an outlet.

Where is the battery charger on a Generac generator?

According to a forum member, the battery charger on a Generac standby generator is under the top cover inside the generator.

How do you charge the battery of a Champion generator?

To charge the dead battery of a Champion generator you typically have to invest in a separate charger, remove the battery, charge the battery, make sure its voltage is high enough, and install the battery again.

Another option is starting your Champion generator with a recoil start since this brand typically has built-in charging when the machine is running.

How do I charge a Westinghouse generator battery?

To charge a Westinghouse generator battery you either plug the included battery charger in the right port or for bigger models, you connect the trickle charger when the generator is off.

How do I charge the battery of a Firman generator?

You should charge the dead battery of a Firman generator by connecting it to a separately bought battery charger.

Smaller Firman generators also sometimes come with a battery charger that you put into the right panel port and an outlet to charge the battery.

How do you charge a Honda generator battery?

To charge the dead battery of a Honda generator you remove the battery and connect it to a battery charger.

Another option is starting the Honda generator with the recoil start since the running generator will charge the battery.

How do I charge the battery of a small generator?

You often charge the battery of a small generator by plugging an included battery charger into the right panel port.

It is also possible that you have to remove the battery and charge it with a separate charger.

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Mats is the founder and head editor of Generator Decision. With a combination of critical thinking, tireless research, and a healthy interest in electronics he helps people find the right generators and how to use these. At this point in the journey, Mats has done research on hundreds of portable generators.