What size battery is in an ATV?

Most ATVs use a 12-volt battery, typically in the 4–9 amp-hour range, with common replacement group sizes such as YTX4L-BS, YTX5L-BS, YTX7L-BS, or YTX9-BS.

The electrical system of an ATV is powered by a 12-volt battery, and the exact capacity depends on engine size, loads from lights or accessories, and the model’s charging system. While 12V sealed lead-acid batteries are standard today, some older or specialty machines may use different configurations; always verify the required spec in the owner’s manual or on the existing battery label.

Typical 12-volt battery sizes used in ATVs

Group sizes and fit

Group size refers to the physical dimensions and terminal layout that must match your ATV’s battery tray and electrical connections. Common ATV replacements fall within several standard 12V footprints.

• YTX4L-BS — 12V, compact footprint, suitable for smaller or youth ATVs.


• YTX5L-BS — 12V, mid-size footprint for many medium-class ATVs.


• YTX7L-BS — 12V, widely used on a broad range of utility and sport ATVs.


• YTX9-BS — 12V, larger footprint used on bigger or heavily loaded models; availability varies by brand.

Note: The exact capacity (Ah) and terminal arrangement vary by model and brand. Always check the battery label or the ATV manual to ensure a correct fit and performance.

Choosing and maintaining the right ATV battery

Before buying or replacing, consider how the battery will fit your ATV and support its electrical needs, including any added accessories or winter use.

• Verify the correct group size and terminal orientation from the owner’s manual or the existing battery.


• Ensure voltage compatibility — most modern ATVs require a 12-volt system.


• Evaluate capacity (Ah) and cold-cranking amps (CCA); higher ratings help with cold starts and when running multiple accessories.


• Choose the battery type—maintenance-free sealed lead-acid (AGM/GEL) is common, while flooded batteries are cheaper but require more upkeep.


• Consider lithium-ion if weight and space are critical, but confirm charging-system compatibility and price considerations.


• Installation safety — match polarity, clean and tighten terminals, and mount securely to prevent vibration damage.


• Maintenance tips — keep terminals clean, use a battery charger when the ATV sits idle, and store in a cool, dry place during off-season.

In practice, replacing an ATV battery is straightforward, but choosing the right one requires confirming fit and electrical needs. When in doubt, consult the dealer or a qualified technician to ensure compatibility with your model’s charging system and accessories.

Summary

For most ATVs, the standard battery size is a 12-volt unit, with common group sizes including YTX4L-BS, YTX5L-BS, YTX7L-BS, and YTX9-BS. The exact capacity and footprint depend on the model, so always verify with your manual or label. Properly matching the group size, voltage, and capacity, along with good maintenance, helps ensure reliable starts and electrical performance in diverse conditions.

Do all ATVs use the same battery?

No, not all ATV batteries are the same; they vary in type, voltage, physical size, and performance characteristics like cold cranking amps (CCA). ATV manufacturers specify the correct battery group size, voltage (though most are 12V), and performance requirements for each model, so it's crucial to match the replacement battery to your specific ATV's needs. 
Key differences to consider

• Battery type: Common types include flooded lead-acid, AGM (Absorbent Glass Mat), and lithium-ion, each with different pros and cons in terms of cost, maintenance, and lifespan. 
• Voltage: While most ATVs use a 12V battery, you must confirm this is correct for your model. 
• Performance (CCA): The cold cranking amps rating indicates the battery's starting power. Different ATVs require different CCA levels, with higher-performance ATVs needing more power. 
• Physical dimensions: The battery must fit properly in the battery compartment. A battery that is too large or small will not fit securely. 
• Capacity (Ah): The amp-hour (Ah) rating indicates how much energy the battery can store. You should choose a battery with the amp-hour rating recommended for your ATV. 

What type of batteries are used in four wheelers?

A four-wheeler uses a 12-volt powersport battery, which is similar to one used in a motorcycle. Common types include flooded, AGM (Absorbed Glass Mat), and newer lithium-ion batteries. When buying a battery, it's important to match the specific group size, voltage, and cold cranking amps (CCA) required by your ATV, which you can find in your owner's manual. 
Battery types

• Flooded: An older, more affordable type that requires regular maintenance, like adding distilled water. 
• AGM (Absorbed Glass Mat): A common, sealed, and maintenance-free option that handles vibration well and has a longer lifespan than flooded batteries. 
• Lithium-ion: A lighter-weight, high-performance option with a very long life, fast charging, and a built-in battery management system. 

Key specifications to check

• Voltage: Almost all four-wheelers use a 12V battery. 
• Group size: The physical dimensions of the battery. 
• Cold Cranking Amps (CCA): The battery's ability to start the engine in cold weather. A higher CCA rating means more starting power. 
• Amp-hour (Ah): A measure of capacity, indicating how long the battery can power a device before needing a recharge. 

What size battery does my ATV take?

12v
What Size Battery Do I Need for my ATV or Quad? All terrain vehicle batteries usually require a 12v powersport battery often marketed as a motorcycle battery. A battery for a 4 wheeler needs to provide the high output needed to start your four-wheeler.

Are ATV batteries 12 or 6 volt?

Most ATVs use 12V batteries, but some older models or children's toy ATVs may use 6V batteries. It is crucial to check your specific vehicle's owner's manual or the existing battery to confirm the correct voltage before replacing it.
 
This video explains the difference between 6 volt and 12 volt batteries: 1mRV Lifestyle & RepairYouTube · Mar 5, 2018
12V ATV batteries 

• Standard for gas-powered ATVs: Most modern, gasoline-powered ATVs use 12V batteries to provide the high power needed to start the engine and run accessories. 
• Charging voltage: A fully charged 12V battery should read between 12.612.612.6 and 13.113.113.1 volts. 

6V ATV batteries 

• Found in specific models: 6V batteries are primarily used in small, electric toy ATVs for children because they don't require as much power and a 12V battery wouldn't physically fit. 
• Older models: Some older, vintage ATVs might have used 6V batteries, though this is less common today. 

Why checking is important

• Compatibility: Using the wrong voltage charger or battery can damage your ATV's electrical system. 
• Vehicle requirements: Different ATV models have different power demands, even within the 12V standard. It's important to match the new battery to your ATV's specific needs, including its cold cranking amps (CCA).