How to Replace or Install an ATV Battery; Step-by-Step

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ATV batteries are considered consumables that need to be replaced from time to time. This guide will help you choose the right battery for your quad and provide step-by-step instructions on removing the old battery and installing a new one. 

How to know if your ATV battery is bad?

Before you go ahead and buy a new battery, it’s a good idea to verify that your old one actually has gone bad. 

Begin by charging your battery properly with an external battery charger. If you don’t know how to charge an ATV battery properly, please refer to this guide.

After charging the battery to a full charge, allow it to rest for at least 12 hours to relieve itself of any surface charge that could lead to a false reading. Then use a multimeter to read the battery’s voltage. Set the multimeter to DC voltage. The red lead goes to the positive battery terminal and the black lead to the negative.

If the battery is not able to hold a charge above 12.4V, it is likely starting to go bad. Another telltale sign of a battery that has gone bad is when it won’t hold a charge over time; the voltage drops even when the battery is not connected and not in use.

Another simple and effective way of testing whether the battery is healthy or not is by performing a so-called load test. You can learn about it in this post.

Head over to this post if you want to learn how long an average ATV battery should last

Find the correct battery for your ATV

All ATV batteries are not the same. They vary in physical size, capacity (Ah-rating), battery terminal location and type, and battery type (traditional lead-acid, AGM, GEL, and Lithium-Ion).

When it comes to determining what battery you need, you have several alternatives.

  • Take note of the model number of your old battery. If it was never replaced, you may simply get a new, identical battery.
  • Refer to your service manual, if you have one at hand. It should have the relevant specifications or battery type listed.
  • Shop online. Use the battery selector that most of the bigger battery online battery retailers have. Just input make, type, and model, and you will get a list of batteries in various price ranges that all should fit.
  • Ask your local auto supply store. Bring your old battery, or take note of its dimensions and take a photo of it and bring it to the store as a reference. 
  • Ask your dealer. They will know what battery you need and usually have it in stock. They do, however, charge more than some of the online alternatives. 

Step-by-step guide: How to replace and install an ATV battery

Tools and supplies you will need:

  • A 10mm wrench or Philips screwdriver to release the terminal connectors.
  • Tools to remove any plastic covers to access the battery.
  • Tools release the battery bracket that is holding the battery in place.
  • Protective eye-wear

1. Locate and access the battery

Some ATVs have the battery located in the front, some in the middle, and others at the bike’s rear end. On some models, the battery is visible when standing next to the bike, while on others, you need to remove plastic covers, the seat, or other components to access the battery.

See if you can spot the battery from the outside. If you see no sign of a battery, your best bet would be removing the seat or the front cover.

Here are a few examples of battery locations on different brands and models:

battery location textron alterra tbx 700
The battery on a Textron Alterra TBX 700 is easily accessible in the rear, underneath the lift-up cargo deck.
battery location polaris sportsman 570
The battery on a Polaris Sportsman 570 is located at the bottom of the frame, at the front end of the bike.
battery location polaris sportsman xp 1000
The battery on a Polaris Sportsman XP 1000 is located underneath the front rack, and a web of cables.

2. Disconnect the BLACK battery cable

  • Remove the BLACK negative (-) cable first.
disconnect the black cable
Disconnect the black battery-cable terminal.

3. Disconnect the RED battery cable

  • Remove the RED positive (+) cable last.
disconnect the red cable
Disconnect the red battery-cable terminal.


  • Always follow the specified order for removal; ALWAYS remove the black cable first.
  • When removing the positive cable, make sure not to touch the negative terminal or a metal part of the ATV, such as the frame, as this will short the battery to ground. 
atv battery terminal
Be careful not to loose the retainer bolt thats inside a slot on the terminal on some ATV batteries.

4. Disconnect the battery retainer/hold-down strap

Different ATV manufacturers use various systems to hold the battery in place. A simple hold-down strap held in place by one bolt is the most common.

  • Unscrew or unbolt the battery retaining mechanism so that the battery loosens.

NOTICE: Again, make sure not to accidentally short the battery to ground by touching the positive terminal with your tool when unbolting the battery.

5. Remove the battery from the vehicle

Take note of which way the battery terminals are oriented. The new battery should be installed the same way. Lift the battery out of its position. You may need to work the nearby wiring a little to gain enough clearance to get the battery out.

remove the battery from the vehicle 1

PS: Remember to recycle the old battery.

6. Activate and charge the new battery for installation

Some batteries are sold as kits that need to be activated before installation. The battery casing comes dry with no fluid, while the battery electrolyte comes in a separate container. 

The kit should come with detailed instructions on how to activate the battery. Make sure to follow them closely!

Other batteries come pre-activated and need no assembly before installation.

Please charge the battery with an external battery charger to make sure it is fully charged before installation. 

While some batteries come pre-charged, it is always good practice to top-off the charge before installing the battery to the ATV. 

The charging system on ATVs does not always have the capacity to charge a battery that holds a low charge, especially if you only go on shorter rides. 

Your battery will lose some of its capacity if left at a low charge over time, so make sure it gets a good start by fully charging it before you start using it. 

7. Put the battery in place and reinstall the battery retainer

Place the battery in the battery tray. Make sure it is oriented the same way as the old battery so that the red cable lines up with the positive battery terminal, and the black cable lines up with the negative battery terminal. 

Reinstall the battery retainer. The retainer bolts should be snug so that the battery does not move or come loose. 

NOTICE: Do not overtighten the retainer bolts, as this may crack the battery housing. 

8. Reconnect the battery terminal connectors to the battery terminals

The battery terminal connectors should always be installed in the reverse order of the removal process. 

IMPORTANT: Install the RED positive (+) cable first to the positive battery terminal, then install the BLACK negative (-) cable to the negative battery terminal.

Related questions

Where is the battery on a four-wheeler?

The battery on a four-wheeler can be located in the bike’s upper front area, in the lower center area, or at the upper rear area. You may need to remove the seat or a plastic cover to see the battery. If you still don’t find the battery, your best option is to refer to your bike’s owner’s manual. It shows the battery’s location with a picture.

When should you replace your ATV battery?

The average ATV battery will last 3-5 years before it needs to be replaced. It’s good practice to replace before it goes bad, to avoid starting issues in an inconvenient situation. Slow engine cranking or an illuminated check battery light are early signs that may indicate that the battery is close to reaching its life expectancy. Sure signs that the battery has gone bad is when it no longer can be charged above 12.4V or when it no longer will hold a charge. 

Can I put a bigger battery in my ATV?

It is OK to install a bigger (higher ah rating) battery to an ATV as long as it is the same voltage, as long as it will fit, and as long as it can be held safely in place with the bike’s battery retaining system. Note that the ATVs charging may not be powerful enough to keep a bigger battery fully charged if you use power-consuming accessories such as a winch without allowing the bike to recharge.

What kind of battery does a four-wheeler take?

ATVs and four-wheelers take 12V lead-acid, AGM, GEL, or Lithium-Ion batteries. Most ATVs come with a conventional flooded lead-acid battery (FLA) or absorbed glass mat (AGM) battery.

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Haavard Krislok
Haavard Krislok
I'm an ATV and offroad-enthusiast, an engineer, a farmer, and an avid home-mechanic. I'm also the owner and editor of If you have any questions or suggestions regarding this article, please feel free to contact me.

Welcome to BoostATV

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