2020 Toyota Corolla Battery Size & Group

Quick answer

• BCI Group Size: 35
• CCA Rating: 350-500 CCA (depending on original equipment and engine size)
• Reserve Capacity: 80-100 minutes
• AGM vs. Flooded: Comes with flooded, but AGM is an excellent upgrade.
• Terminal Layout: Top post, B (standard positive on left, negative on right when facing the battery)
• Physical Dimensions: Approximately 9.06" (L) x 6.89" (W) x 8.86" (H)
• Dual-Battery Setup: Not applicable (not a diesel vehicle)

Replacement battery options

Here are some popular replacement battery options for your 2020 Toyota Corolla. Always double-check fitment with your retailer.

• Interstate: MT-35 / MTP-35 (flooded), MTZ-35 (AGM)
• Optima: YellowTop DS46B24R (though a Group 35 RedTop is often a direct fit if you prefer starting-only power)
• DieHard: Platinum AGM Group 35 (AGM), Gold Group 35 (flooded)
• Odyssey: 35-PC1400 (AGM)
• ACDelco: 35AGM (AGM), 35S (flooded)

AGM vs flooded — which does this vehicle need?

The 2020 Toyota Corolla typically comes equipped with a conventional flooded lead-acid battery from the factory. While a standard flooded battery will serve its purpose just fine as a replacement, an Absorbent Glass Mat (AGM) battery is an excellent upgrade option.

AGM batteries offer several advantages: they are more resistant to vibration, have a slower self-discharge rate, and are sealed, meaning they are spill-proof and maintenance-free. They also tend to handle the demands of modern vehicles with more onboard electronics better, providing more consistent power delivery. If your Corolla has start-stop technology, an AGM battery is highly recommended, as they are specifically designed to handle the frequent cycling associated with these systems. For a standard Corolla without start-stop, an AGM battery offers enhanced durability and longevity, making it a worthwhile investment for many owners.

Post-installation relearn / reset procedure

After disconnecting and replacing the battery in your 2020 Toyota Corolla, you might notice some minor issues that require a simple reset or relearn procedure. Here's what you might need to do:

1. Idle Relearn: The engine's computer (ECU) may need to relearn its idle parameters. After installing the new battery, start the vehicle and let it idle for 10-15 minutes without touching the accelerator. This allows the ECU to recalibrate.
2. Power Window Reset: You might find that the automatic up/down function for your power windows doesn't work. To reset them, lower each window completely, then raise it completely, holding the button for a few seconds at the top and bottom of the travel. Repeat for all windows.
3. Radio/Navigation Settings: Your radio presets and navigation history will likely be lost. You'll need to re-enter them manually.
4. Clock Setting: The clock will need to be reset to the correct time.
5. Tire Pressure Monitoring System (TPMS): In some cases, the TPMS light might illuminate. Driving the vehicle for a short period (10-20 minutes) at speeds above 25 mph often allows the system to recalibrate itself. If it persists, consult your owner's manual for a specific reset procedure or visit a dealership.
6. Safety System Calibration: Modern Toyotas have advanced safety features (Toyota Safety Sense). While a battery disconnect usually doesn't require a full recalibration of these systems, if you notice any warning lights or unusual behavior, it's best to have a professional check it.

Signs of a failing battery

Knowing the signs of a failing battery can save you from being stranded. Look out for these common indicators:

• Slow Engine Crank: The most common sign. If your engine cranks slowly or struggles to turn over, it's a strong indication your battery is weak.
• Dim Headlights/Interior Lights: When the engine is off but accessories are on, dim lights point to low battery voltage.
• Warning Lights: A battery warning light on your dashboard is a direct indicator of a problem.
• Corrosion on Terminals: White or green powdery substance on the battery terminals can impede current flow.
• Swelling or Bloating Battery Case: A swollen battery case usually indicates internal damage, often due to overcharging or extreme heat.
• Sulphuric Odor: A smell like rotten eggs around the battery can indicate a leaking or damaged battery.
• Old Age: A car battery typically lasts 3-5 years. If yours is older, it's wise to have it tested.

Common battery issues for this generation

The 2020 Toyota Corolla, being a relatively new model, doesn't have a long history of endemic battery issues. However, common challenges often reported across late-model vehicles, including the Corolla, typically revolve around:

• Parasitic Draws: Modern vehicles contain numerous electronic modules that can draw small amounts of power even when the car is off. If a module malfunctions or stays awake, it can cause a