2016 Subaru Crosstrek Battery Size & Specs: Group, CCA, & Replacements

As an ASE-certified master technician, I’ve seen countless Subaru vehicles roll through the bays for battery-related issues. The 2016 Subaru Crosstrek is a fantastic, reliable crossover, but like all modern vehicles, it relies heavily on a healthy electrical system. If you're experiencing sluggish starts or flickering lights, it's likely time for a new battery.

Here is the ultimate guide to the 2016 Subaru Crosstrek battery specifications, replacement options, and installation tips.

Quick answer: 2016 Subaru Crosstrek Battery Specs

When sourcing a replacement battery for your 2.0L 2016 Subaru Crosstrek, keep these factory specifications and fitment requirements in mind:

• BCI Group Size: Group 35
• Cold Cranking Amps (CCA): 390 CCA (OEM minimum). Technician Note: Most aftermarket replacements will upgrade you to 500-650 CCA, which is highly recommended for better winter performance.
• Reserve Capacity (RC): 90-100 minutes
• AGM vs Flooded: Standard Flooded Lead-Acid is the OEM equipment, but upgrading to an AGM (Absorbent Glass Mat) is perfectly compatible and often recommended.
• Terminal Layout: Standard Top Post, Positive on the Left (when viewing from the front of the battery).
• Physical Dimensions: 9.06" L x 6.81" W x 8.88" H (Group 35 standard).
• Dual-Battery Setup: N/A (Single battery system).

Replacement battery options

If you are heading to the parts store, here are some of the most popular, high-quality Group 35 replacement batteries that will drop right into your 2016 Crosstrek:

1. Optima RedTop (Group 35): Known for incredible vibration resistance and strong starting power. (Optima Part # 8020-164)
2. DieHard Platinum AGM (Group 35): An excellent premium option offering high reserve capacity and great extreme-weather performance.
3. Interstate Mega-Tron Plus or MTZ AGM (Group 35): Interstate is a staple in many professional shops. The MTZ-35 AGM provides fantastic longevity.
4. ACDelco Gold (Group 35): A highly reliable standard flooded or AGM replacement if you want dependable everyday performance.

AGM vs flooded — which does this vehicle need?

The 2016 Subaru Crosstrek came from the factory with a standard flooded lead-acid battery. Because this generation does not have a highly aggressive Auto Start-Stop system, a standard flooded battery will work perfectly fine and save you a bit of money.

However, as a master tech, I frequently recommend upgrading to an AGM (Absorbent Glass Mat) battery. AGMs are completely sealed, maintenance-free, and handle extreme temperatures much better than flooded batteries. If you live in an area with harsh winters, frequently take short trips, or have added aftermarket accessories (like off-road lights or a dashcam), an AGM battery is absolutely worth the extra investment.

Post-installation relearn / reset procedure

When you disconnect the battery on a 2016 Crosstrek, the Engine Control Module (ECM) loses its learned idle values, and the power windows lose their auto-up programming. Here is how to perform the reset procedure:

1. Electronic Throttle Relearn: Ensure all accessories (radio, A/C, lights) are OFF. Turn the key to the ON position (do not start the engine) for 10 seconds. Turn the key OFF.
2. Idle Relearn: Start the engine and let it idle in Park without touching the throttle for 10-15 minutes until it reaches full operating temperature. Turn the A/C ON and let it idle for another 2-3 minutes.
3. Window Reset: Roll the driver's window all the way down. Then, pull the window switch up to roll it all the way up, and hold the switch in the UP position for 3 seconds after the window is fully closed. Repeat for other auto-windows if necessary.

Signs of a failing battery

Don't wait until you're stranded to replace your battery. Look out for these warning signs:

• Slow Engine Crank: If the starter sounds sluggish or "heavy," the battery's CCA is likely degraded.
• Corrosion on Terminals: Excessive white or blue fluffy buildup on the battery posts creates high resistance.
• Dimming Headlights: If your headlights dim noticeably when idling or when turning the steering wheel (electric power steering draws heavy current).
• Age: If your battery is over 3 to 4 years old, it is living on borrowed time.

Common battery issues for this generation

One specific quirk with this era of Subaru vehicles is a tendency for parasitic battery drains related to the Starlink infotainment and telematics system (DCM). If your Crosstrek frequently sits for several days and the battery dies, it may not just be a bad battery—you could have a dark current draw. Upgrading to a high-reserve-capacity AGM battery helps mitigate the symptoms of this, but if the problem persists, a shop will need to perform a parasitic draw test.

Dealing with electrical issues can be frustrating, and proper installation is key to your Subaru's longevity. Find a trusted shop on Repairius.