What Type of Battery a 2012 Honda Civic Takes

The 2012 Honda Civic typically uses a 12‑volt BCI Group 51R battery. Most gasoline trims (including the 1.8L and Si) take a Group 51R flooded lead‑acid or AGM battery with at least ~410 CCA, while the Civic Hybrid uses the same 12V Group 51R format (often AGM) alongside its separate high‑voltage traction battery. Below are the specs, trim nuances, and buying tips to ensure a correct fit.

Key Specifications for a 2012 Honda Civic Battery

These are the core fitment and performance details that match the 2012 Civic’s battery tray, cables, and electrical needs.

• BCI Group Size: 51R (the “R” indicates reversed terminals—positive post on the right when posts face you)
• Voltage: 12 V
• Dimensions (approx.): 9.4 x 5.1 x 8.8 inches (238 x 129 x 224 mm)
• Cold Cranking Amps (CCA): Minimum ~410 CCA; 450–500+ CCA recommended for cold climates or higher accessory loads
• Reserve Capacity (typical): ~70–80 minutes (varies by brand/model)
• Type: Standard flooded lead‑acid; AGM is an upgrade option that offers better vibration resistance and deep‑cycle tolerance
• Polarity/Layout: 51R reversed terminals; ensure cable reach and hold‑down compatibility

Choosing a battery that meets the 51R size and at least the minimum CCA ensures proper cranking power and a correct physical fit in the Civic’s battery tray.

Trim-by-Trim Notes

While most 2012 Civics share the same physical battery group, electrical demands can vary slightly by trim and equipment.

• 1.8L Gasoline Models (LX/EX/EX-L, etc.): Group 51R flooded or AGM; aim for 410–500+ CCA.
• Civic Si (2.4L): Also typically Group 51R; consider higher CCA or AGM for spirited driving or added accessories.
• Civic Hybrid: Uses a 12V auxiliary battery in Group 51R (often AGM from many suppliers) plus a separate high‑voltage hybrid pack that is not the same as the 12V starter battery.
• Civic Natural Gas (GX): Generally Group 51R as well; verify hold‑down and terminal orientation.

If your Civic has unusual equipment or aftermarket electronics, confirm the battery tray, hold‑down, and cable lengths before purchase.

Compatible Examples and Part Numbers

Below are common market examples to look for when shopping. Exact SKUs can vary by retailer and region, but the key is “Group 51R.”

• Interstate: MT-51R (flooded), MTX-51R (AGM)
• Duralast: 51R-DL (flooded), 51R-DLG (Gold, higher CCA), 51R-AGM (Platinum AGM)
• DieHard: 51R (Silver/Gold depending on store), 51R-AGM (Platinum AGM)
• ACDelco: Gold/Professional 51R
• Honda OEM: 51R specification (part number varies by market/dealer)

Brand naming and availability change over time; matching the BCI Group 51R size, terminal orientation, and desired CCA is more important than a specific model name.

How to Verify Fitment Before You Buy

A few quick checks help ensure you get the right battery the first time.

1. Check your owner’s manual or the existing battery label for “Group 51R.”
2. Confirm terminal orientation: positive on the right when the posts face you.
3. Measure the tray and hold‑down to ensure 51R dimensions will seat correctly.
4. Choose CCA for your climate: higher CCA for colder regions or heavier accessory loads.
5. If you own a Hybrid, remember the 12V battery is separate from the high‑voltage pack; select a 51R (often AGM) auxiliary battery.

These checks reduce the chance of cable reach issues, poor fit, or insufficient cranking power.

Installation Tips and Post‑Install Checks

Proper installation improves reliability and avoids electrical hiccups.

• Use a memory saver if possible to preserve radio presets and settings.
• Clean terminals and apply dielectric grease to reduce corrosion.
• Secure the hold‑down to factory torque—overtightening can damage the case.
• No battery “registration” is required on a 2012 Civic, but you may need to reset the clock or radio; some cars auto‑restore via VIN recognition.
• After install, verify charging voltage with the engine running: typically around 13.7–14.7 V.

Following these steps helps the new battery last longer and ensures your Civic’s electronics behave normally after replacement.

Summary

The 2012 Honda Civic uses a BCI Group 51R 12‑volt battery across most trims, including the Si, with at least ~410 CCA and reversed terminals. Flooded lead‑acid units are standard; AGM is a worthwhile upgrade, especially for harsher climates or higher accessory loads. Hybrid models also use a Group 51R 12V auxiliary battery (commonly AGM) in addition to their separate high‑voltage pack. Always confirm group size, terminal orientation, and CCA before buying.

What size battery does a Honda Civic use?

A Honda Civic typically uses a Group Size 51R or Group Size 47 (H5) battery, depending on the model year. Newer models, starting with the 2022 Civic, commonly use the H5 size due to increased electrical demands of the car. Some older models may use the 51R size. 
Here’s a more detailed breakdown:

• Group Size 51R: This was a common size for older Civic models. 
• Group Size 47 (H5): This is the more common size for newer Civic models, particularly those from 2022 onwards. The H5 designation refers to the DIN standard for battery size. 
• Interchangeability: It’s worth noting that some sources indicate that Group 47 and H5 batteries are interchangeable. However, it’s always best to confirm compatibility with your specific vehicle year and model. 
• Other Factors: When choosing a battery, consider the cold cranking amps (CCA), reserve capacity, and terminal type (SAE, etc.) to ensure proper fit and performance, according to Advance Auto Parts and AutoZone. 

Do Hondas need a special battery?

Types of Batteries for Honda Vehicles
Honda vehicles typically require either lead-acid or AGM (Absorbent Glass Mat) batteries.

How much does it cost to replace a 2012 Honda Civic battery?

How much to replace the battery in my Honda? Depending on power, size, and quality, prices for a replacement car battery range from about $45 to $250. Your local dealership, auto parts store or automotive service center can check your current battery or hook you up with a new car battery.

What size battery is in a 2012 Honda Civic?

51R
Duralast Group Size 51R Battery 51R-DL.