2020 Subaru Crosstrek Battery Size & Group

Quick Answer

• BCI Group Size: 25 or 35
• CCA Rating: 550 CCA minimumrecommended
• Reserve Capacity: 90-100 minutes
• AGM vs. Flooded: Flooded (standard) is OEM, but AGM is a popular upgrade
• Terminal Layout: Top post, typically positive on the right (JIS D-type posts)
• Physical Dimensions: (Group 25) 9.06" L x 6.81" W x 8.94" H; (Group 35) 9.06" L x 6.81" W x 8.94" H
• Dual-battery Setup: Not applicable (not a diesel vehicle)

Replacement Battery Options

For your 2020 Subaru Crosstrek, here are some popular replacement battery options. Always double-check fitment with your chosen retailer.

• Interstate: Group 25 or 35 (e.g., MT-25, MT-35)
• Optima: Optima RedTop 35 (note: may require a spacer for proper height due to smaller form factor)
• DieHard: DieHard Gold Group 25 or 35
• Odyssey: Odyssey 35-PC1400 (AGM)
• ACDelco: ACDelco Advantage 25 or 35 (flooded)

AGM vs. Flooded — Which Does This Vehicle Need?

Your 2020 Subaru Crosstrek originally came equipped with a standard flooded lead-acid battery. This type of battery is perfectly adequate for the vehicle's needs. However, an Absorbent Glass Mat (AGM) battery is a popular upgrade for several reasons.

AGM batteries offer several advantages:

• Durability: They are more resistant to vibration and impacts, making them a good choice for rough roads or off-road adventures.
• Longevity: They generally have a longer lifespan than flooded batteries.
• Maintenance-free: AGM batteries are sealed and do not require watering.
• Better performance in extreme temperatures: They tend to perform better in both very hot and very cold conditions.
• Handles parasitic draws better: If your Crosstrek sits for extended periods or has accessories that draw a small amount of power, an AGM battery can often handle these "parasitic draws" better without deep discharging.

While an AGM battery can be a worthwhile upgrade, it's not strictly 'needed.' If you opt for an AGM battery, ensure it's designed to fit your Crosstrek's battery tray and hold-down clamp. No special charging system modifications are typically required for a newer vehicle like the 2020 Crosstrek when switching from flooded to AGM.

Post-installation Relearn / Reset Procedure

After replacing the battery in your 2020 Subaru Crosstrek, some systems may need to re-learn or reset. This is a relatively simple procedure:

1. Idle Relearn: After connecting the new battery, start the engine and let it idle for about 10-15 minutes without touching the accelerator. This allows the engine control unit (ECU) to re-learn its idle parameters.
2. Power Window Reset: The automatic up/down function for the power windows may need to be reset. For each window:
   • Fully lower the window using the switch.
   • Hold the switch down for a few seconds after it reaches the bottom.
   • Fully raise the window using the switch.
   • Hold the switch up for a few seconds after it reaches the top.
   • Repeat for all windows until the auto function works normally.
3. Radio/Navigation Settings: You will likely need to re-enter any presets for your radio and navigation system, as well as reconnect Bluetooth devices.
4. Date/Time: Reset the clock to the correct date and time.
5. Steering Angle Sensor (potentially): In some cases, the steering angle sensor might need recalibration if a warning light appears. This usually involves driving the vehicle for a short distance (e.g., in a straight line) or turning the steering wheel full lock to full lock. If a warning light persists, consult your owner's manual or a Subaru dealership.

Always consult your owner's manual for specific instructions regarding battery replacement and post-installation procedures.

Signs of a Failing Battery

Recognizing the signs of a failing battery can save you from being stranded. Common indicators include:

• Slow Engine Crank: The engine turns over slowly or sluggishly when you try to start it.
• Dim Headlights/Interior Lights: Lights appear dim, especially when the vehicle is not running.
• Warning Lights: A battery warning light or check engine light (sometimes triggered by low voltage) may illuminate on your dashboard.
• Clicking Sound: A rapid clicking sound when trying to start the car, indicating insufficient power to engage the starter motor.
• Corrosion on Terminals: Excessive white or blue powdery corrosion around the battery terminals.
• Swollen Battery Case: The battery case appears swollen or bloated, which can indicate internal damage or overcharging.
• Age: Batteries typically last 3-5 years. If yours is older, it's prudent to have it tested.

Common Battery Issues for this Generation

The 2020 Subaru Crosstrek, like many modern vehicles, relies heavily on its electrical system. While generally reliable, there are a few considerations:

• Parasitic Drain: Subarus, including the Crosstrek, can sometimes be susceptible to parasitic drains, where components continue to draw small amounts of power even when the vehicle is off. This can lead to a dead battery, especially if the car sits for extended periods. Common culprits can include aftermarket accessories, malfunctioning infotainment systems, or interior lights not turning off fully.
• Short Trips: If your typical commute involves only very short trips, the alternator may not have enough time to fully recharge the battery, leading to premature battery degradation.
• Cold Weather Performance: While modern batteries are robust, extreme cold can significantly reduce battery capacity and starting power. Ensuring your battery is in good health before winter is crucial.
• Start-Stop Technology (if equipped): If your Crosstrek has start-stop technology, it will place more demands on the battery. Vehicles with this feature often come with enhanced flooded (EFB) or AGM batteries from the factory, which are designed to handle the increased cycling. Ensure any replacement battery is suitable for start-stop applications if your vehicle has this feature.

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