2018 Honda CR-V Battery: Group Size, CCA & Replacement Guide

Quick answer

• BCI Group Size: Group 47 (also called H5). Some base models may use a Group 96R, but the Group 47/H5 is the most common size and the recommended fit for models with more electronic features.
• Cold Cranking Amps (CCA): The original Honda battery has around 435 CCA. However, for better performance, especially in colder climates, we recommend a replacement with at least 500 CCA, with many premium options offering 600 CCA or more.
• Reserve Capacity (RC): Aim for a Reserve Capacity of at least 90 minutes. This provides a good safety margin for running your vehicle's electronics if the alternator fails.
• AGM vs. Flooded: All 2018 Honda CR-V models equipped with push-button start and the auto idle-stop feature require an Absorbent Glass Mat (AGM) battery. If your model has a traditional key start, it may have come with a standard flooded battery, but upgrading to an AGM is highly recommended for longevity and to better handle the demands of modern vehicle electronics.
• Terminal Layout: The Group 47/H5 battery has a standard layout with the positive terminal on the right when the battery is viewed from the front (terminals closest to you).
• Physical Dimensions (Group 47/H5):
  • Length: 9.5 inches (242 mm)
  • Width: 6.9 inches (175 mm)
  • Height: 7.5 inches (190 mm)
• Dual-Battery Setup: Not applicable. The 2018 Honda CR-V uses a single 12-volt battery.

Replacement battery options

When choosing a replacement, it’s crucial to verify the fitment for your specific CR-V trim (LX, EX, EX-L, Touring). Always double-check the part number with the retailer before purchasing. Here are some popular and reliable replacement options:

• Interstate MTX-47/H5 AGM: A top-tier choice known for its reliability and strong warranty. This is often a go-to for its OEM-level quality or better.
• DieHard Platinum AGM Battery, Group Size 47/H5: A widely available and respected brand, the Platinum AGM line offers excellent cranking power and a long service life.
• ACDelco 47AGM Professional AGM BCI Group 47 Battery: As a trusted OEM supplier for many brands, ACDelco’s professional-grade AGM is a solid, dependable option.
• Optima / Odyssey: As of this writing, Optima and Odyssey do not offer a direct-fit battery for the 2018 Honda CR-V without potential modifications to the hold-down or tray. It is best to stick with a direct-fit Group 47/H5.

AGM vs flooded — which does this vehicle need?

The distinction is critical for the 2018 CR-V. The models featuring the auto idle-stop system put a significant and frequent strain on the battery. Each time the engine shuts off at a stoplight, the battery must power all the vehicle's electronics—from the radio and climate control fan to the various control modules. Then, it must provide the burst of energy to restart the engine instantly.

A standard flooded battery is not designed for this type of deep-cycling and rapid recharging. Using one in a CR-V that requires an AGM will lead to a very short battery life and potential electrical system issues. AGM batteries are engineered to handle these demands effectively, providing the necessary power and accepting a quick recharge from the alternator.

Even if your CR-V has a keyed ignition, upgrading to an AGM battery is a wise investment. It provides a more stable power supply for the numerous electronic components on board and typically lasts longer than a flooded counterpart.

Post-installation relearn / reset procedure

Fortunately, Honda makes this process relatively straightforward. After replacing the battery, you may need to perform a few simple resets:

1. Idle Relearn Procedure: The vehicle's computer needs to relearn the engine's idle characteristics. Start the engine and let it idle (with no accessories on) for about 10 minutes. Driving the vehicle for a few miles will also allow the system to recalibrate.
2. Power Window Reset: You will likely lose the "auto-up/down" function for the power windows. To reset it, go to each window switch. Roll the window all the way down, then roll it all the way up and hold the switch in the "up" position for 2-3 seconds after the window closes. You should hear a faint click, indicating the memory has been reset.
3. Radio/Navigation Code: Most modern Hondas have radio systems that are tied to the vehicle's VIN and do not require a security code after a power loss. However, if your screen prompts for a code, it can usually be retrieved from the dealership or, in some cases, by holding the radio power button for a few seconds.

Signs of a failing battery

• Slow Engine Crank: The most common symptom. The engine turns over sluggishly when you push the start button or turn the key.
• Dashboard Warning Lights: A battery warning light is a clear sign, but a weak battery can also cause other seemingly unrelated warning lights to flicker on, such as ABS or Check Engine.
• Dimming Lights & Electrical Issues: Headlights may dim when the engine is idling and brighten when you rev it. You might also notice interior lights flickering or the infotainment system acting glitchy.
• Visible Corrosion: A build-up of white or blueish powder around the battery terminals indicates leaking battery acid and a compromise in the battery's seal.

Common battery issues for this generation

The fifth-generation CR-V (2017-2022) is an excellent vehicle, but some owners have reported premature battery failure. This is often attributed to the combination of extensive vehicle electronics, the demands of the idle-stop system, and potential software parameters that can lead to a parasitic draw. Some owners have reported the battery dying after the vehicle sits for just a few days. Using a high-quality AGM battery and ensuring your vehicle’s software is up to date during service visits can help mitigate these concerns.

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