What Group Size Battery Is in a 2010 Hyundai Elantra?

The typical replacement battery group size for a 2010 Hyundai Elantra is **Group 124R**, although some trims and markets may also accept **Group 47 (H5)** or **Group 35**, depending on engine, region, and whether modifications have been made. Below is a detailed breakdown of how this fits with Hyundai’s specifications and what owners should know when choosing a replacement battery.

Understanding the 2010 Hyundai Elantra’s Battery Specification

The 2010 Hyundai Elantra, sold mainly in GLS, SE, Blue, and Touring variants in North America, uses a 12‑volt lead‑acid starting battery sized to fit its compact engine bay and electrical demand. Automakers designate this size using standardized “group numbers,” which define the battery’s physical dimensions, terminal layout, and fitment.

The Most Common OEM-Style Group Size: 124R

For most U.S. and Canadian 2010 Elantra sedans and Touring models with the 2.0L 4‑cylinder engine, the battery originally fitted from the factory or matched in dealer parts systems is typically **Group 124R**.

Key Details of Group 124R

The following points summarize the main attributes of the 124R battery size used in many 2010 Hyundai Elantras.

• Physical dimensions: Roughly 10.3 in (L) × 6.8 in (W) × 8.9 in (H), depending on brand
• Polarity: “R” indicates reversed terminals compared with a standard 124
• Cold Cranking Amps (CCA): Typically in the 550–650 CCA range for quality replacements
• Type: Conventional flooded lead-acid or AGM, 12‑volt automotive starting battery
• Fitment: Designed to match the OEM tray and hold‑down pattern in many 2010 Elantras

Taken together, these characteristics explain why Group 124R is frequently listed by major parts retailers and dealer catalogs as the direct-fit option for the 2010 Elantra in North America.

Alternative Group Sizes That May Also Fit

While 124R is often the default recommendation, many 2010 Elantras can physically accept other common group sizes that share similar dimensions and terminal locations. These alternatives are frequently surfaced in parts-store fitment guides and used by owners where catalog data or regional specs differ.

Group 47 (H5) as a Compact Option

Some battery retailers list **Group 47 (H5)** as a compatible size for the 2010 Elantra, particularly in areas where European‑style battery formats are more common.

• Size and type: Slightly different footprint but still compact, 12‑volt starting battery
• CCA range: Typically around 500–650 CCA, adequate for the 2.0L engine
• Mounting: May require minor adjustment of the hold‑down or tray, depending on brand and tray design
• Availability: Widely available as H5/47 in AGM or flooded styles

This means Group 47 can be a practical alternative where 124R is scarce or when the vehicle’s battery tray and hold‑down hardware accommodate the H5 format securely.

Group 35 in Some Fitment Catalogs

Another size that appears in some cross-reference guides is **Group 35**.

• Dimensions: Similar length and width to many compact/mid‑size car batteries
• Polarity: Standard orientation that may differ from 124R, making terminal placement important
• CCA: Commonly 550–700+ CCA, more than sufficient for a 2.0L gasoline engine
• Fit details: Can fit some Elantras if the hold‑down and cable reach are compatible

Because terminal position and cable length can vary, Group 35 is generally considered a “may fit” rather than a guaranteed drop‑in replacement, so a physical check before purchase is advised.

How to Confirm the Correct Battery Size for Your Specific Car

Fitment for a 2010 Hyundai Elantra can differ slightly by build date, trim, market, and prior modifications. Verifying the correct size helps avoid installation issues and ensures proper electrical performance.

Steps Owners Should Take Before Buying

The following steps can help an owner confirm the best group size for a specific 2010 Elantra before purchasing a new battery.

1. Check the label on the existing battery: Look for a “Group Size” or “BCI” marking such as 124R, 47/H5, or 35.
2. Measure the battery tray: Compare length, width, and height of the current battery and available space in the tray.
3. Note terminal orientation: Confirm that positive and negative posts line up properly with the factory cables.
4. Consult an online fitment guide: Use reputable auto-parts sites, entering year, make, model, and engine to cross-check recommendations.
5. Verify with a dealer or repair shop: A Hyundai dealer’s parts department can look up the official spec by VIN.

These checks generally take only a few minutes and provide assurance that the new battery will physically fit, connect correctly, and match the electrical needs of the vehicle.

Performance Considerations Beyond Group Size

While group size ensures physical compatibility, other battery specifications can affect reliability and service life in a 2010 Hyundai Elantra, especially in harsh climates or for vehicles with heavier electrical loads.

Key Specs to Keep in Mind

When selecting a new battery, paying attention to performance ratings can improve cold‑weather starts and long‑term durability.

• Cold Cranking Amps (CCA): Aim for at least the OEM rating (often around 550 CCA); higher CCA can aid cold starts.
• Reserve Capacity (RC): Higher RC helps maintain power to accessories when the engine is off.
• Battery type: AGM batteries tend to tolerate heat and vibration better, though they cost more than flooded types.
• Warranty: A longer free-replacement period can indicate greater durability and better coverage.

Matching or modestly exceeding the original equipment specs within the correct group size usually gives the best mix of reliability, cost, and straightforward installation.

Summary

For most 2010 Hyundai Elantras in North America, the standard replacement battery group size is **BCI Group 124R**, designed to match the factory tray and terminal layout. Depending on trim, region, and prior replacements, some cars may also accept **Group 47 (H5)** or **Group 35**, provided the battery fits the tray and the terminals align properly with the cables. Confirming the group size on the existing battery, checking physical fit, and verifying with a trusted fitment guide or dealer ensures the right choice for reliable starting and long service life.