What Size Battery Group Is in a 2012 Hyundai Elantra?

The typical replacement battery size for a 2012 Hyundai Elantra (most trims) is Group 124R, although some models and markets may use Group 47 (H5/L2). The safest approach is to verify with the vehicle’s specifications or directly check the label on the existing battery before purchase.

Understanding the 2012 Hyundai Elantra Battery Group Size

The 2012 Hyundai Elantra uses a compact 12-volt battery designed to fit its relatively tight engine bay and meet modern electrical demands. Across North America, the most commonly specified battery group for this model is Group 124R, which refers to a standardized size and terminal layout used by most major battery brands.

Main Battery Group for Most 2012 Hyundai Elantra Models

For the majority of U.S. and Canadian–market 2012 Hyundai Elantras with the 1.8L 4-cylinder engine, parts catalogs from major auto retailers and battery manufacturers list Group 124R as the standard fitment. This group size provides enough cold-cranking amps (CCA) and reserve capacity to support both starting needs and the vehicle’s electronics.

The following list outlines the key characteristics generally associated with a typical Group 124R battery as commonly used in the 2012 Elantra.

• Physical size: Compact battery with dimensions around 10.2″ (L) x 6.8″ (W) x 7.5″ (H), varying slightly by brand.
• Terminal orientation: “R” designation (124R) indicates reversed terminal layout compared with a standard 124 group, which is important for cable reach and fitment.
• Cold-cranking amps (CCA): Commonly in the 500–650 CCA range, sufficient for typical climates and the Elantra’s starter requirements.
• Reserve capacity (RC): Often in the 80–100 minute range, providing a buffer for electrical load if the alternator output is reduced or temporarily unavailable.
• Top-post design: Standard top posts, compatible with the Elantra’s factory battery cables and clamps.

Taken together, these traits make Group 124R a widely compatible and readily available choice that matches the factory design and electrical demands of most 2012 Elantra models.

Possible Alternative: Group 47 (H5/L2) in Some Markets or Trims

While Group 124R is the predominant specification, catalog data and service experience show that some 2012 Elantra vehicles—especially in certain markets or with different original equipment suppliers—may be fitted with a battery that cross-references to Group 47 (also known as H5 or L2 in European sizing). This is more common outside North America, or when an earlier replacement battery followed an alternate sizing standard.

The following list summarizes typical characteristics of a Group 47 (H5/L2) battery as it may relate to a 2012 Elantra.

• Physical dimensions: Roughly 9.6″ (L) x 6.9″ (W) x 7.5″ (H), slightly different footprint compared with 124R but generally similar height.
• Terminal configuration: Standard top-post layout consistent with many European- and Asian-spec vehicles.
• CCA range: Typically around 550–650 CCA, comparable to or slightly higher than many 124R offerings.
• Common use: Frequently used in compact and midsize vehicles with similar engine sizes and electrical loads.
• Fitment considerations: May require checking the hold-down bracket and cable reach to ensure secure installation and proper polarity alignment.

Because of these dimensional and layout nuances, Group 47 can be a viable alternative in some vehicles, but it should only be used when it clearly matches what is already in the car or is explicitly listed as an approved equivalent in a reputable fitment guide.

How to Confirm the Correct Battery Group for Your Specific Elantra

Even though Group 124R is widely listed as the correct battery group for the 2012 Hyundai Elantra, small variations in production, region, or previous replacement batteries mean you should confirm your exact fitment before purchasing.

Check the Existing Battery Label

The fastest and most reliable way to confirm the correct battery group size is to look directly at the battery under the hood. Most batteries sold in North America print the BCI group number clearly on the top or side label. If it shows “124R,” you can confidently buy the same group. If it shows “47,” “H5,” or “L2,” you’ll want to match that size instead.

The following list details practical steps to identify your current battery’s group and specifications when inspecting it in the vehicle.

1. Open the hood: Ensure the engine is off and the car is in park with the parking brake set.
2. Locate the battery: The battery is typically on the driver’s side near the front of the engine bay on the 2012 Elantra.
3. Read the label: Look for markings such as “GROUP 124R,” “124R,” “Group 47,” “H5,” or “L2,” often printed near brand and model information.
4. Note CCA and RC: Check the cold-cranking amps and reserve capacity to choose a replacement with equal or better ratings.
5. Confirm terminal orientation: Ensure that the positive and negative posts are in the same relative positions when you select a new battery.

By systematically checking the battery label and key specs, you reduce the risk of buying a unit that doesn’t physically fit or that places the terminals on the wrong side for the factory cables.

Use Online Fitment Tools and the Owner’s Manual

Battery manufacturers, large auto-parts chains, and Hyundai documentation all provide cross-reference data for the 2012 Elantra. These resources are a useful backup if the battery label is worn, missing, or unclear.

The following list summarizes the best reference sources and how they help confirm the correct group size.

• Owner’s manual: Often lists recommended battery capacity, type, and sometimes the physical specification or a Hyundai part number.
• Online parts catalogs: Retailers such as AutoZone, Advance Auto Parts, O’Reilly Auto Parts, and big battery brands allow you to enter “2012 Hyundai Elantra 1.8L” and display compatible group sizes (commonly 124R, sometimes 47).
• Dealer parts department: A Hyundai dealer can look up the original battery specification by VIN and suggest the factory-equivalent group.
• Professional mechanic: Local shops often know which groups reliably fit and can recommend an appropriate capacity for your climate and driving pattern.
• Hyundai technical bulletins: In rare cases, service bulletins may update or clarify recommended replacement parts, including battery specs.

Cross-checking at least two of these sources—such as your manual and an online catalog—helps ensure the battery you purchase matches both the physical space and the electrical requirements of your specific Elantra.

What to Look for Beyond Just Battery Group Size

While the group number ensures physical fit and terminal layout, the performance and reliability of your 2012 Elantra’s battery also depend on several electrical and design characteristics. Selecting a proper group size is only the first step in choosing a suitable replacement.

Cold-Cranking Amps and Climate Considerations

The 2012 Elantra is not unusually demanding on battery capacity, but the climate where you drive has a major impact on what CCA rating is appropriate. Most catalog listings for Group 124R batteries already account for typical climate ranges, yet you can upgrade if you face extreme conditions.

The points below outline what to consider regarding CCA in different environments when selecting a battery for your Elantra.

• Cold climates: In regions with harsh winters, choosing a battery at the higher end of the typical 124R CCA range (around 600–650 CCA) improves cold-start reliability.
• Mild climates: In moderate environments, a midrange CCA battery (around 500–600 CCA) will usually be sufficient and cost-effective.
• Hot climates: High heat stresses batteries over time; paying attention to overall battery quality and warranty may matter more than extra CCA alone.
• Electrical load: If you regularly use accessories like heated seats, high-powered audio, or additional electronics, higher CCA and reserve capacity can add a margin of reliability.
• Manufacturer minimums: Never go below the manufacturer’s recommended minimum CCA, as that can compromise starting performance and battery life.

Selecting a battery with at least the recommended CCA—and ideally slightly above for demanding climates—helps ensure consistent starts and better long-term durability.

Battery Technology and Quality

Within the correct group size, different battery technologies can affect service life, resistance to deep discharge, and maintenance needs. While the 2012 Hyundai Elantra does not require any specialized technology such as an AGM battery for start-stop systems, you may encounter various options on the shelf.

The following list compares common battery types and quality indicators relevant to a 2012 Elantra owner selecting a Group 124R replacement.

• Standard flooded lead-acid: Most common and generally the least expensive option; adequate for typical daily driving without heavy accessory loads.
• AGM (Absorbent Glass Mat): Offers better resistance to vibration and deep discharge, and often longer life, though at a higher price; can be a good upgrade if budget permits.
• Warranty length: Longer free-replacement warranties (e.g., 3 years) usually indicate higher-quality construction and may justify higher upfront cost.
• Brand reputation: Well-known brands and batteries sold through reputable retailers tend to offer more consistent performance and support.
• Production date: Regardless of type, selecting a recently manufactured battery (check the date code) helps ensure full capacity and longevity.

Focusing on an appropriate technology level and a reputable brand, in addition to the correct group size, increases the odds that your replacement battery will deliver reliable service for several years.

Summary

For a 2012 Hyundai Elantra, the commonly specified battery group in North America is Group 124R, providing the correct footprint, height, and reversed terminal layout to fit the factory tray and cables. In some cases—particularly in certain markets or with prior replacement batteries—you may encounter Group 47 (H5/L2) as an alternative fit. To avoid mistakes, confirm the group number printed on your existing battery or consult the owner’s manual and a reputable fitment guide before purchase.