What Size Battery Is in the 2018 Hyundai Accent?

The 2018 Hyundai Accent typically uses a Group 124R 12‑volt lead‑acid battery, with around 550–600 cold cranking amps (CCA) and a capacity in the mid‑40 Ah range, though exact specifications can vary slightly by trim and brand. Understanding these details helps owners choose a correct replacement and avoid electrical or fitment issues.

Standard Battery Type and Group Size

The 2018 Hyundai Accent, sold mainly with a 1.6‑liter four‑cylinder engine, is designed to use a compact but robust 12‑volt battery that balances size, starting power, and cost. In North America, most mainstream fitment guides and parts catalogs converge on one primary group size as the factory‑equivalent choice.

Factory-Equivalent Group Size

In automotive battery sizing, “group size” refers to the physical dimensions, terminal layout, and mounting style standardized by organizations such as the Battery Council International (BCI). For the 2018 Accent, the commonly specified group is:

The following list outlines the key identifying details of the standard battery group used in the 2018 Hyundai Accent.

• Battery group size: BCI Group 124R
• Voltage: 12 V
• Polarity/layout: “R” indicates reversed terminal layout compared with a standard Group 124
• Physical role: Starter battery for engine cranking and powering vehicle electronics
• Common type: Flooded lead‑acid or enhanced flooded (EFB) in some aftermarket options

These group specifications ensure that a Group 124R battery will fit the factory tray, align properly with the clamps, and reach the cables without stretching or modification.

Typical Electrical Specifications

While the group size ensures the battery will physically fit, electrical performance—especially cold cranking amps and reserve capacity—is what determines reliable starting and support for electronics in different climates.

Cold Cranking Amps (CCA)

Cold cranking amps are a measure of how much current a battery can deliver at 0°F (‑18°C) for 30 seconds while maintaining at least 7.2 volts. For the 2018 Accent, most OEM‑equivalent options sit in a mid‑range suitable for a compact gasoline engine.

The list below summarizes typical CCA ratings you’ll find when shopping for a 2018 Hyundai Accent battery.

• Typical CCA range: Approximately 550–600 CCA for many aftermarket Group 124R batteries
• Entry‑level options: Around 500–550 CCA (adequate in milder climates)
• Premium or “high‑performance” options: 600+ CCA, aimed at better cold‑weather starting
• OEM ballpark: Commonly mid‑500s CCA, depending on region and supplier

Staying near or above the original CCA specification is recommended, particularly in colder climates where stronger cranking performance can reduce strain on the starter and improve reliability.

Capacity and Reserve Capacity

Battery capacity for cars like the Accent is usually not marketed in detail to consumers, but approximate amp‑hour (Ah) values and reserve capacity (RC) matter if you use power with the engine off—such as lights, audio, or accessories.

The following list gives an overview of typical capacity characteristics for a Group 124R battery in a 2018 Accent.

• Approximate capacity (Ah): Mid‑40 Ah range (often about 45 Ah, depending on brand)
• Reserve capacity (RC): Often in the 80–100 minute range (ability to supply 25 A at 80°F before dropping below 10.5 V)
• Design purpose: Short bursts of high current for starting, plus moderate electrical support
• Not a deep‑cycle battery: Not intended for frequent, full discharges

Though many owners never need to consult these numbers, they become important if the car regularly powers accessories while parked or if you’re comparing higher‑end battery lines that advertise extended reserve capacity.

Fitment, Dimensions, and Terminal Configuration

Physically correct fitment is as important as electrical ratings. A battery that is too tall, wide, or with reversed terminals can create safety risks or force awkward cable routing. Group 124R simplifies this by defining a standardized footprint and layout.

Dimensions and Mounting

The Group 124R classification defines a common size across brands, with small variations measured in millimeters. These values are approximate, and height can change slightly with different case designs or caps.

The list below summarizes the typical dimensions and mounting characteristics of a Group 124R battery used in the 2018 Hyundai Accent.

• Length: Approximately 10.0–10.3 inches (about 255–262 mm)
• Width: Approximately 6.8–7.0 inches (about 173–178 mm)
• Height: Approximately 7.5–8.0 inches (about 190–203 mm), including terminals
• Case profile: Rectangular, designed for common small‑car trays
• Hold‑down style: Bottom or side ridge compatible with factory clamp system

Matching these dimensions ensures the battery sits securely in the tray, allowing the hold‑down bracket to clamp it properly and preventing movement under acceleration, braking, or impact.

Terminal Orientation (Why the “R” Matters)

The “R” suffix in 124R is more than a labeling detail—it signals that the posts are reversed compared with a standard 124 layout. If you install the wrong orientation, your cables may not reach or could be forced across the battery, creating risk of shorts or damage.

The key terminal layout considerations can be summarized as follows.

• Polarity orientation: With the battery’s terminals closest to you, Group 124R typically places the positive terminal on the right
• Versus non‑R: A standard Group 124 would place positive on the left in this viewing position
• Cable length: The Accent’s cables are sized for the 124R layout; using a non‑R group could stretch or misroute them
• Safety note: Correct orientation minimizes the chance of accidental contact between the positive post and bodywork or brackets

Because of this orientation, owners should confirm they are purchasing Group 124R—not just “124”—to ensure both a safe and hassle‑free installation.

Common Variations by Market and Brand

While Group 124R is the predominant fitment for the 2018 Hyundai Accent in North America, there can be minor variations by region, trim level, and battery supplier. However, the overall size and performance class remain broadly similar.

Regional and Trim-Level Differences

In some markets outside North America, particularly in Europe or parts of Asia, Hyundai and local suppliers may use slightly different coding systems or variants that still align closely with the same physical footprint and function.

The following list captures the main ways battery specifications may vary without affecting day‑to‑day use.

• Labeling differences: Local codes or part numbers instead of BCI “124R” language
• Slightly different CCA ratings: Warmer climates may see lower CCA values; colder regions may use higher ratings
• Brand variation: OEM‑supplied battery might be branded Hyundai, Delkor, or another regional provider
• Technology type: Some markets may stock more enhanced flooded (EFB) or maintenance‑free designs as the default

Even with these regional variations, the replacement process is broadly the same: match the physical size, terminal orientation, and at least the original CCA rating to maintain proper performance.

Choosing a Replacement Battery

When the original battery in a 2018 Hyundai Accent reaches the end of its life—often around 4–6 years depending on climate and usage—owners face a wide selection of aftermarket options. Knowing the key parameters can simplify that choice.

What to Look For When Buying

Battery retailers often list several alternatives that technically fit the car. Focusing on a few core criteria helps avoid under‑performing or ill‑fitting units, especially if you live in a demanding climate.

Below are the main factors to consider when selecting a new battery for a 2018 Accent.

• Correct group size: Prioritize Group 124R to ensure proper fit and terminal placement
• Equal or higher CCA: Match or exceed the original CCA (typically mid‑500s) for reliable starting
• Warranty length: Look for at least a 2–3 year free‑replacement warranty from reputable brands
• Battery type: Standard flooded is adequate; EFB or premium lines may offer longer life and better resilience
• Reputation and service: Choose suppliers that offer testing, installation help, and recycling

By checking these points, owners can balance cost, performance, and peace of mind, particularly if the vehicle is exposed to heat, short trips, or long storage periods.

Installation and Compatibility Notes

Replacing the battery in a 2018 Accent is relatively straightforward but still benefits from basic precautions. Modern cars rely on consistent voltage for sensitive electronics, and incorrect handling can cause avoidable issues.

The following list outlines practical tips to keep in mind during installation.

• Preserve settings: If possible, use a memory saver to maintain radio presets and some module settings
• Disconnect safely: Remove the negative (‑) terminal first, then the positive (+), and reverse that order when reconnecting
• Secure the hold‑down: Always reinstall the clamp so the battery cannot move under load
• Check corrosion: Clean terminals and cable ends; apply dielectric grease if desired
• Verify operation: After installation, confirm all lights, infotainment, and starting are functioning as expected

Taking these steps helps ensure both safe operation and maximum life from the new battery, while reducing the chances of electrical glitches after the swap.

Summary

The 2018 Hyundai Accent is designed to use a compact 12‑volt starter battery, most commonly specified as BCI Group 124R. This group ensures the correct physical size, reversed terminal orientation, and compatibility with the factory tray and cables. Typical replacements offer around 550–600 CCA and a capacity in the mid‑40 Ah range, which is sufficient for the Accent’s 1.6‑liter gasoline engine and onboard electronics.

When replacing the battery, owners should prioritize the correct group size (124R), match or exceed the original CCA, and choose a reputable brand with an appropriate warranty. With these considerations, selecting and installing a new battery becomes a straightforward task that supports reliable starting and consistent electrical performance over the life of the car.