The Outback uses a standard 12-volt automotive battery, typically Group Size 35, with a conventional flooded lead-acid design.
This article explains what that means for owners, how to identify the right replacement, and what specs to check when shopping for a new battery for your 2011 Outback.
Core specs you should know
The following list covers the main attributes commonly specified for the 2011 Outback's battery. Keep in mind that exact numbers can vary by climate and retailer, so always check the label on your current battery or the owner's manual for the precise spec.
- Voltage: 12 volts
- Battery type: Conventional flooded lead-acid (not typically an OEM AGM battery in standard trims)
- Group size: OE spec is typically Group Size 35
- Cold-cranking amps (CCA): commonly in the 520–600 A range, depending on manufacturer and climate
- Reserve capacity (RC): typically about 90–100 minutes
- Maintenance: Generally maintenance-free beyond terminal cleaning and ensuring proper charging
In short, when shopping, verify the group size, CCA, RC, and that the battery is compatible with your climate and driving needs.
How to choose and install the right replacement
Use this checklist to guide your selection and installation process. The following points help ensure you get a battery that matches the car's electrical demands.
- Match the group size (typically 35) to ensure fit in the battery tray and terminal positions
- Confirm CCA is adequate for cold-weather starts if you live in a cold climate
- Check RC to support accessory use without the engine running
- Decide between flooded lead-acid and AGM based on budget and performance needs
Bottom line: confirm specs from the OEM label or manual and choose a battery that meets or exceeds those numbers.
Practical tips for installation and care
Before installation, gather basic tools, disconnect the negative terminal first, then the positive, remove the hold-down, swap the battery, and reconnect terminals in the reverse order. If the car has been sitting, inspect for corrosion on terminals and clean as needed. If unsure, have a technician perform the replacement.
Summary: The 2011 Subaru Outback uses a standard 12V lead-acid battery, typically Group Size 35, with CCA around 520–600 A and RC around 90–100 minutes. Always verify the exact specs on your current battery or in the owner's manual and replace with a battery that meets or exceeds those numbers.