2022 Subaru Crosstrek Battery Size & Specs Guide

Welcome to the Repairius battery spec reference guide for the 2022 Subaru Crosstrek. As an ASE-certified master technician, I've serviced countless Subaru vehicles. The Crosstrek is a phenomenal crossover, but like all modern vehicles equipped with Auto Start-Stop technology, it places heavy demands on its battery. If you are experiencing hesitation during engine starts or electrical gremlins, it might be time for a replacement. Here is everything you need to know about the 2022 Subaru Crosstrek’s battery system.

Quick answer

Here are the key battery specifications you need to know for your 2022 Subaru Crosstrek:

• BCI Group Size: Group 35 (Standard/Premium trims often use a Q-85 spec equivalent to Group 35) or LN2 / H5 (for certain trims/options). Always verify your tray size before buying.
• Cold Cranking Amps (CCA): 620 CCA or higher recommended.
• Reserve Capacity (RC): 100 minutes minimum.
• Battery Type: EFB (Enhanced Flooded Battery) or AGM (Absorbent Glass Mat) is required due to the Auto Start-Stop system.
• Terminal Layout: Standard top-post (Positive on the left, Negative on the right when viewed from the front).
• Physical Dimensions (Group 35): Approximately 9.1" L x 6.9" W x 8.9" H.
• Dual-Battery Setup: Not applicable (standard single 12V system).

Replacement battery options

When replacing the battery in your Crosstrek, investing in a high-quality unit will save you from premature failures, especially with the heavy cyclic loads of Auto Start-Stop. Here are some of the most reliable options available:

• Interstate Batteries MTX (AGM): Interstate MTX-35. An excellent AGM upgrade providing fantastic deep-cycle capabilities and vibration resistance.
• DieHard Platinum AGM: Group 35 (Part # 35-AGM). Provides 650 CCA and is engineered specifically to handle modern electrical loads and start-stop tech.
• Optima YellowTop: Group 35 (Part # D35). Optima’s spiral-cell design offers deep cycling and excellent starting power.
• Odyssey Extreme Series: ODP-AGM35. A premium choice with massive reserve capacity and true dual-purpose functionality.

AGM vs flooded — which does this vehicle need?

The 2022 Subaru Crosstrek comes standard with an Auto Start-Stop system. Because the engine frequently shuts off at traffic lights while the radio, HVAC, and lights remain on, a standard flooded lead-acid battery simply cannot survive the constant deep discharge and recharge cycles.

Subaru equips these vehicles from the factory with an Enhanced Flooded Battery (EFB). However, when replacing it, I highly recommend upgrading to an AGM (Absorbent Glass Mat) battery. AGM batteries charge up to five times faster than traditional flooded batteries and have a much longer cycle life, making them the perfect, durable match for the Crosstrek's demanding electrical architecture. Do not install a conventional standard flooded battery, or you will likely be replacing it again within a year.

Post-installation relearn / reset procedure

After disconnecting the battery on a 2022 Crosstrek, the vehicle’s modules will reset. You will need to perform a few simple relearn procedures:

1. Auto Power Windows: Roll the driver’s window all the way down and hold the switch for 2–3 seconds. Roll it all the way up and hold the switch for 2–3 seconds. Repeat for any other auto-equipped windows.
2. Steering Angle Sensor (VDC System): Start the engine. Turn the steering wheel lock-to-lock (all the way left, then all the way right), and then center it. This initializes the Vehicle Dynamics Control system.
3. Idle Relearn: Turn the key to the ON position (engine off) for 10-15 seconds. Turn it off. Start the engine and let it idle without touching the throttle, AC off, for about 10 minutes so the ECM can relearn the base idle position.

Signs of a failing battery

Look out for these common warning signs that your Crosstrek's battery is on its way out:

• Auto Start-Stop Malfunction: The system stops engaging, and the Auto Start-Stop indicator on the dash gets crossed out. The computer disables this feature to preserve enough power to start the car.
• Slow Engine Crank: The engine sounds sluggish or hesitates when you turn the key or push the start button.
• Flickering Lights: Headlights or interior lights dim significantly when starting the engine or when the AC compressor kicks on.
• Corrosion: Heavy blue/white powder buildup around the battery terminals (though AGM batteries resist this much better than flooded ones).

Common battery issues for this generation

The primary complaint among owners of this generation of Subaru Crosstrek is premature battery failure. This is almost entirely driven by the strain of the Auto Start-Stop system combined with modern parasitic draws (like Starlink telematics staying active while parked). Upgrading from the factory EFB to a robust aftermarket AGM battery is the most effective way to solve this generation's notorious appetite for 12V batteries.

If you aren't comfortable replacing the battery and performing the necessary relearns yourself, leave it to the pros. Find a trusted shop on Repairius.