2016 Subaru Forester Battery Size & Group

Quick Answer

• BCI Group Size: 25 or 35
• CCA Rating: 500-600 CCA recommended
• Reserve Capacity: 90-110 minutes
• AGM vs. Flooded: Either is acceptable, but consult your owner's manual. AGM often preferred for longevity and deep-cycle capabilities.
• Terminal Layout: Top post, typically right-hand positive
• Physical Dimensions: Approximately 9.06" L x 6.81" W x 8.86" H (may vary slightly by group size)
• Dual-Battery Setup: Not applicable (not a diesel)

Replacement Battery Options

For your 2016 Subaru Forester, here are some popular replacement battery options. Note that part numbers can change, so always verify with your retailer.

• Interstate: MT-25 (Group 25) or MT-35 (Group 35)
• Optima: YellowTop DS46B24R (often fits as a Group 35 equivalent for some models, but verify dimensions) or RedTop 35
• DieHard: Platinum AGM Group 25 or Gold Group 35
• Odyssey: 35-PC1400 (Group 35)
• ACDelco: 25AGM (Group 25 AGM) or 35AGM (Group 35 AGM)

AGM vs. Flooded — Which Does This Vehicle Need?

The 2016 Subaru Forester generally came from the factory with a standard flooded lead-acid battery. While a flooded battery will work just fine as a replacement, an Absorbent Glass Mat (AGM) battery is often a superior choice. AGM batteries offer several advantages, including:

• Improved Durability: More resistant to vibration and impacts.
• Longer Lifespan: Can last longer than flooded batteries under similar conditions.
• Better Performance in Extreme Temperatures: More consistent power delivery in hot and cold weather.
• Maintenance-Free: No need to check electrolyte levels or add distilled water.
• Slower Self-Discharge: Holds a charge longer when not in use.

While an AGM battery typically costs more upfront, its benefits often outweigh the added expense over its lifetime, especially if your Forester is equipped with many electronics or if you live in an area with extreme temperatures. Always confirm with your owner's manual for any specific battery requirements or recommendations from Subaru.

Post-Installation Relearn / Reset Procedure

After disconnecting and replacing the battery in your 2016 Subaru Forester, you may experience some minor issues or warning lights. This is normal as the vehicle's various electronic control units (ECUs) lose their learned memory. Here's a typical procedure to help the car "relearn" and reset systems:

1. Idle Relearn: Start the engine and let it idle for 10-15 minutes without touching the accelerator. This allows the engine control unit (ECU) to re-learn its idle parameters.
2. Window One-Touch Reset: For each power window, lower it all the way down and hold the button for a few seconds. Then, raise it all the way up and hold the button for a few seconds. This restores the one-touch up/down function.
3. Radio/Navigation Settings: You will likely need to re-enter your radio presets, clock, and any navigation preferences.
4. Tire Pressure Monitoring System (TPMS): The TPMS light may illuminate initially. Drive the vehicle for a few miles at speeds above 15-20 mph, and the system should reset automatically. If it doesn't, consult your owner's manual for a specific reset procedure or visit a repair shop.
5. Steering Angle Sensor: Some vehicles may require a steering angle sensor calibration. This often involves turning the steering wheel full left, then full right, and back to center. Refer to your owner's manual if you experience issues with stability control or ABS lights after battery replacement.

If any persistent warning lights or drivability issues remain, it's best to consult a qualified technician.

Signs of a Failing Battery

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

• Slow Engine Crank: The engine turns over sluggishly when you try to start it.
• Dim Headlights/Interior Lights: Lights appear fainter than usual, especially when the engine is off.
• Warning Lights: A battery or charging system light on your dashboard.
• Corrosion on Terminals: Fuzzy blue, green, or white buildup on battery posts or cables.
• Bloated or Cracked Battery Case: A sign of internal damage or overcharging.
• Clicking Sound: A rapid clicking when trying to start the car, indicating insufficient power to engage the starter motor.
• Frequent Jump Starts: Needing to jump-start your car repeatedly is a clear sign.

Common Battery Issues for This Generation

Owners of 2016 Subaru Foresters occasionally report:

• Parasitic Draws: These vehicles, like many modern cars, have numerous electronic modules that can sometimes draw power even when the car is off, leading to premature battery drain if a module malfunctions or remains active.
• Original Equipment Battery Lifespan: Some owners find the factory-installed battery may only last 3-4 years, especially in climates with extreme temperatures, prompting the need for an earlier replacement than some other vehicles.
• Sensitivity to Low Voltage: Subaru vehicles can sometimes be sensitive to low battery voltage, causing various electrical gremlins or warning lights to appear even with a slightly weakened battery.

Regular battery testing, especially as your battery approaches three years of age, can help you proactively replace it before it leaves you stranded.

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