The 2009 Acura TSX uses a standard 12-volt automotive battery, with the replacement most commonly found in Group Size 35. Always verify the exact size on the car’s original battery label or in the owner’s manual.
Key facts about the 2009 TSX battery
The TSX’s battery sits in the engine bay and is designed to power a mid-size, 2.4-liter i-VTEC engine plus standard accessories. In practice, most replacement batteries for this model are Group Size 35, which fits the tray and terminal layout for the vast majority of units. Some regional variants or aftermarket configurations may use a different size, so it’s important to confirm the exact specification for your vehicle.
What Group Size 35 means
Group Size 35 is a common dimension set used for many mid-size cars. It balances fit within the engine bay, terminal placement, and power delivery, providing adequate cold-cranking amps (CCA) for reliable starts across a range of climates.
Note: Always confirm the exact size by checking the battery label on your car’s current battery or consulting the owner’s manual.
How to verify the exact size for your car
Before buying a replacement, use these checks to confirm the correct group size and fit:
- Inspect the existing battery label for the “Group Size” designation (for example, “Group 35”).
- Consult the owner’s manual or a dealership service bulletin for the recommended group size.
- Measure the battery tray and hold-downs to ensure the replacement will fit.
- Provide your VIN to a parts retailer to confirm compatibility for your exact vehicle configuration.
By confirming these details, you avoid purchasing a battery that doesn’t fit or that interferes with cable routing and mounting hardware.
Shopping tips: choosing a replacement
When selecting a battery, focus on both fitment and performance specs:
- Group Size: Most 2009 TSX models use Group Size 35.
- Cold Cranking Amps (CCA): Higher CCA improves cold-start performance; aim for roughly 450–520 CCA depending on climate.
- Reserve Capacity (RC): A higher RC helps power more accessories during cranking or short drives without the engine running.
- Maintenance type: Flooded lead-acid is common and cost-effective; AGM options offer longer life and better performance in extreme temperatures, at a higher price.
- Terminal layout: Ensure the replacement’s terminals and cable routing match your car’s setup (top-post vs. side-post as applicable).
Choosing a battery that meets or exceeds OEM specifications will help ensure reliable starts and a longer service life for your TSX.
Bottom line and practical steps
For the 2009 Acura TSX, the standard replacement battery is a 12-volt automotive battery in Group Size 35. Verify the exact size on the original battery label or in the owner’s manual, and match or exceed the recommended CCA and RC for your climate. If you’re unsure, consult a trusted parts retailer or dealership with your vehicle’s VIN.
Summary: The typical battery size for a 2009 Acura TSX is Group Size 35, 12V. Always confirm the exact size on the original battery label or in the manual, and consider climate-appropriate CCA and RC when shopping. This ensures proper fit and reliable performance.