2025 Subaru Forester Battery Size & Group

Quick Answer

• BCI Group Size: 25
• CCA Rating: 550 CCA (minimum)
• Reserve Capacity: 90-100 minutes
• AGM vs. Flooded: EFB (Enhanced Flooded Battery) or AGM recommended due to start-stop technology.
• Terminal Layout: Top Post, Positive Right (SAE Post)
• Physical Dimensions (approximate): 9.06" L x 6.89" W x 8.86" H
• Dual-Battery Setup: Not applicable (not a diesel vehicle)

Replacement Battery Options

For your 2025 Subaru Forester, selecting the right replacement battery is crucial, especially with its start-stop technology. Here are some popular options:

• Interstate: MTP-25 or MTX-25 (AGM)
• Optima: YellowTop DH6 (may require adapter or different hold-down for Group 25 applications, verify fitment carefully)
• DieHard: Platinum AGM Group 25
• Odyssey: ODP-AGM25A (requires specific charging profile for optimal lifespan, confirm with Odyssey)
• ACDelco: 25AGM

Note: Always double-check the latest part numbers and fitment with your specific retailer or manufacturer, as specifications can change.

AGM vs. Flooded — Which Does This Vehicle Need?

The 2025 Subaru Forester, like many modern vehicles, utilizes start-stop technology to improve fuel efficiency. This system places significantly higher demands on the battery. Therefore, an EFB (Enhanced Flooded Battery) or an AGM (Absorbent Glass Mat) battery is highly recommended, and often required by Subaru, over a traditional flooded lead-acid battery.

Traditional flooded batteries are not designed to handle the frequent, deep discharges associated with start-stop systems. EFB batteries are a step up, offering better cyclic stability and charge acceptance. However, AGM batteries offer the best performance and longevity for start-stop vehicles. They are more robust, can withstand deeper discharge cycles, recharge faster, and are spill-proof. While an AGM battery might have a higher initial cost, its extended lifespan and superior performance often justify the investment for vehicles with start-stop functionality.

Using a standard flooded battery in a 2025 Forester equipped with start-stop technology can lead to premature battery failure and potential issues with the start-stop system itself.

Post-Installation Relearn / Reset Procedure

After disconnecting and replacing the battery in your 2025 Subaru Forester, several systems may require a re-learning or reset procedure. While the vehicle's computer (ECU) will often relearn basic parameters on its own over a few drive cycles, some systems might need manual intervention:

1. Idle Relearn: After reconnecting the battery, the engine's idle speed might be rough or higher than usual. Drive the vehicle for 10-15 minutes at varying speeds, including some stop-and-go driving. The ECU should gradually relearn the correct idle parameters. You can also let the engine idle for about 10 minutes after reconnection without touching the accelerator.
2. Power Window Auto Up/Down: The one-touch auto up/down function for the power windows may need to be reset. For each window:
   • Fully lower the window by holding down the switch.
   • Fully raise the window and continue holding the switch in the