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The recommended battery size for the 2011 Mazda RX-8 is the iS35-AGM Group Size 35 with 650 cold cranking amps (CCA). CCA measures the battery's ability to start the engine, especially in extreme weather conditions. More CCA means better performance. Typically, batteries in the 2011 Mazda RX-8 last around 3 to 4 years, shorter in hot and humid areas. You can test the battery to check its remaining life. If the car won't start, the issue may be a dead or faulty battery. A new one can cost between $100 and $300, depending on the brand and store.
The Mazda RX8 comes with a Group Size 35 battery that has a cold cranking amps rating of 650. It is also referred to as 35/85 in some cases.