2023 Subaru Forester Battery Size & Specs
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Quick answer
- BCI Group Size: Group 35 (H6/48 may also fit with modifications)
- Cold Cranking Amps (CCA): 550 CCA (minimum)
- Reserve Capacity (RC): 100 minutes
- Battery Type: Enhanced Flooded Battery (EFB) or Absorbent Glass Mat (AGM) required
- Terminal Layout: Left-hand positive (standard SAE posts)
- Dimensions (L x W x H): 9.1" x 6.9" x 8.7"
Replacement battery options
- Interstate: MTX-35
- Optima: YELLOWTOP DH6
- DieHard: Platinum AGM 35
- Odyssey: ODP-AGM35
- ACDelco: 35AGM
AGM vs flooded — which does this vehicle need?
The 2023 Subaru Forester comes equipped with an auto start-stop system, which requires an Enhanced Flooded Battery (EFB) or an Absorbent Glass Mat (AGM) battery. A standard flooded battery will not be able to handle the frequent cycling of the start-stop system and will fail prematurely. AGM batteries are recommended for their superior performance and longevity in this application.
Post-installation relearn / reset procedure
After replacing the battery in your 2023 Subaru Forester, you will need to perform a relearn procedure to ensure that the vehicle's systems are operating correctly. This can be done by following these steps:
- Turn the ignition to the "ON" position (do not start the engine).
- Wait for the dash lights to cycle and the gauges to sweep.
- Turn the ignition to the "OFF" position.
- Repeat steps 1-3 two more times.
- Start the engine and let it idle for at least 10 minutes to allow the engine control module (ECM) to relearn the idle and fuel trim settings.
Signs of a failing battery
- Slow engine crank
- Dimming headlights, especially when the engine is off
- Clicking sound when turning the key
- Warning light on the dashboard
- Corroded battery terminals
- Swollen or leaking battery case
Common battery issues for this generation
The most common battery issue for the 2020-2024 Subaru Forester is premature battery failure due to the demands of the auto start-stop system. This can be exacerbated by short driving trips, which do not allow the battery to fully recharge. If you are experiencing frequent battery problems, it is recommended to have your charging system checked by a qualified technician.
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More specs for the 2023 Subaru Forester
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Key Fob Programming
DIY programming steps, FCC ID, fob PN, battery, transponder.
Same spec — other model years
Maintenance & repair guides
2023 Subaru Forester Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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Values can vary by engine, trim and build date; check your VIN-specific service information. Updated 2026-08-21.