The Eclipse uses a standard 12-volt automotive battery.
For the 2007 model year, Mitsubishi offered two engines (a 2.4-liter inline-four or a 3.8-liter V6). The exact battery size, or group size, depends on the engine and market. The correct size is always stamped on the battery label or listed in the owner's manual, and replacement should match that original specification to ensure proper fit and terminal orientation.
Battery options by engine
Why the group size varies
The 2007 Eclipse’s two available engines can require different physical battery sizes and terminal configurations. Always verify the specific group size for your car before purchasing a replacement.
To shop confidently, know that the typical replacement will be a 12-volt lead-acid battery, with the exact group size determined by engine and trim. The label on your current battery will indicate the correct group size, CCA, RC, and weight ratings.
Before listing common options, here is a general guide to help you understand what to expect when shopping for a replacement.
- 12-volt automotive battery (the standard for most passenger cars, including the Eclipse).
- Group size is engine-dependent; the base four-cylinder and the V6 may use different sizes and terminal layouts.
- When shopping, prioritize matching the original group size and ensuring the battery fits the tray, posts, and clearance under the hood.
- Check cold-cranking amps (CCA) and reserve capacity (RC) appropriate to your climate and driving needs; higher CCA is beneficial in colder climates.
Concluding note: The exact group size for your 2007 Eclipse should be confirmed on the existing battery label or in the owner's manual before purchasing a replacement.
How to identify and replace the battery
If you need to replace the battery, follow these steps to ensure safety and a proper fit. This guidance is general; consult a professional if you’re unsure or if you have the V6 model with additional electrical loads from aftermarket equipment.
- Turn off the engine and all accessories; wear eye protection and disconnect jewelry.
- Disconnect the negative (usually black) terminal first, then the positive terminal.
- Remove the hold-down clamp and lift the battery straight out; inspect the tray for corrosion and clean as needed.
- Install the replacement battery in the same orientation, secure with the hold-down clamp, and reconnect the terminals (positive first, then negative).
- Start the engine to verify proper operation and reset any electronic systems as required.
Conclusion: If you’re uncertain about the correct group size or the replacement process, have a qualified technician handle the replacement to avoid damage to the electrical system.
Summary
The 2007 Mitsubishi Eclipse uses a standard 12-volt automotive battery. The exact group size varies by engine (2.4L inline-four or 3.8L V6) and market, so you should verify the correct size on the existing battery label or in the owner’s manual before buying a replacement. Always ensure the new battery matches the original specifications for fit, capacity, and terminal orientation, and consider professional assistance if needed.