2022 Subaru Forester Battery Replacement Guide

Quick Answer

• BCI Group Size: 35
• CCA Rating: 550-640 CCA (varies by trim and original equipment)
• Reserve Capacity: 90-110 minutes
• AGM vs. Flooded: Both AGM and flooded batteries are generally compatible, but AGM is often recommended for better performance and longevity, especially with start/stop systems.
• Terminal Layout: Top Post, Positive on Right (when viewed from the front of the battery with terminals closest to you)
• Physical Dimensions: Approximately 9.06" L x 6.89" W x 8.86" H
• Dual-Battery Setup: Not applicable (Subaru Forester uses a single battery)

Replacement Battery Options

Here are some popular replacement battery options for your 2022 Subaru Forester. Always double-check fitment and specifications before purchasing.

• Interstate: MT5-35, MTZ-35 (AGM)
• Optima: 8020-164 (RedTop, 35)
• DieHard: Platinum AGM Group 35
• Odyssey: 35-PC1400 (AGM)
• ACDelco: 35AGM (AGM), 35PST (Flooded)

AGM vs. Flooded — Which Does This Vehicle Need?

The 2022 Subaru Forester, like many modern vehicles, can utilize both AGM (Absorbed Glass Mat) and traditional flooded lead-acid batteries. While a standard flooded battery will work, an AGM battery is often the superior choice for several reasons:

1. Start/Stop Technology: If your Forester is equipped with an engine start/stop system, an AGM battery is highly recommended. These systems place increased demands on the battery, as it needs to crank the engine frequently. AGM batteries are designed to handle these deeper discharge and recharge cycles much more effectively than flooded batteries.
2. Increased Electrical Demands: Modern vehicles have more electronic components and accessories than ever before. AGM batteries offer better power delivery and can withstand the higher electrical loads without degrading as quickly.
3. Durability and Longevity: AGM batteries are more resistant to vibration and extreme temperatures, contributing to a longer lifespan. They are also spill-proof and maintenance-free, offering peace of mind.
4. Performance: AGM batteries generally offer higher CCA ratings and a more consistent power output throughout their life.

While an AGM battery typically costs more upfront, its benefits in performance, durability, and longer lifespan often make it a more cost-effective choice in the long run for your 2022 Subaru Forester.

Post-Installation Relearn / Reset Procedure

After replacing the battery in your 2022 Subaru Forester, it's important to be aware that certain systems may require a relearn or reset procedure. This is common in modern cars due to the sophisticated electronic control units (ECUs).

Here's a general procedure and what to expect:

1. Initial Start-Up: After connecting the new battery, start the vehicle. You may notice some warning lights illuminated on the dashboard initially (e.g., Traction Control, ABS, Check Engine). These often clear themselves after driving for a short period as the systems re-calibrate.
2. Window Auto Up/Down: The automatic up/down function for your power windows may not work correctly. To reset them, lower each window completely, then raise it completely and hold the switch for a few seconds at the top. Repeat for all windows.
3. Radio/Navigation Settings: Your radio presets, clock, and potentially navigation settings will likely be lost. You will need to re-enter these manually.
4. Idle Relearn: The engine's idle speed might be slightly erratic for a short time after a battery disconnect. The ECU will "relearn" the proper idle strategy over a few drive cycles. You can often expedite this by letting the car idle for 10-15 minutes after reconnection, without accessories running.
5. Steering Angle Sensor: In some cases, the steering angle sensor may need recalibration. This typically involves turning the steering wheel full lock to the left, then full lock to the right, and then centering it. A short drive might also help it relearn.

If any warning lights persist after driving for a reasonable distance (e.g., 50-100 miles) or if you experience unusual drivability issues, it's best to consult a qualified mechanic or your Subaru dealership.

Signs of a Failing Battery

Being able to identify the signs of a dying battery can save you from being stranded. Here are common indicators:

• Slow Engine Crank: The most common sign. If your engine cranks slowly or struggles to turn over, especially in cold weather, your battery is likely weak.
• Dim Headlights/Interior Lights: If your lights appear dim when the engine is off, or flicker when starting, it indicates a low battery charge.
• Warning Lights: A "Battery" or "Check Engine" light on your dashboard can sometimes point to a battery or charging system issue.
• Corrosion on Terminals: White, powdery, or blue-green corrosion around the battery terminals can impede current flow and is a sign of a leaking battery or poor connection.
• Bloated or Swollen Battery Case: If the battery case looks swollen or bulging, especially on the sides, it's a sign of internal damage, often due to overcharging or extreme heat. This is very dangerous and requires immediate replacement.
• Old Age: Car batteries typically last 3-5 years. If your battery is within this age range or older, it's wise to have it tested.

Common Battery Issues for This Generation

The 2022 Subaru Forester, being a relatively new model within its generation, benefits from modern battery technology and vehicle electrical systems. However, some general considerations apply:

• Start/Stop System Demands: As mentioned, the start/stop feature places higher demands on the battery. If your driving consists predominantly of short trips, the battery might not get fully recharged, leading to premature wear. An AGM battery mitigates this.
• Parasitic Drains: Ensure all accessories are turned off when the vehicle is not in use. Aftermarket accessories (remote start, dash cams, etc.) can sometimes create parasitic drains if not installed correctly, slowly depleting the battery over time.
• Extreme Temperatures: Both extreme heat and extreme cold can shorten battery life. Heat can cause internal components to break down faster, while cold reduces a battery's cranking power.
• Infrequent Driving: Letting the vehicle sit for extended periods without driving can lead to battery discharge. If you don't drive your Forester often, consider using a trickle charger to maintain battery health.

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