How long is mazda6's battery?
 

I just get my 4th new battery in my mazda6 today. Just wonder someone like me has battery issue or not.

My 06 mazda6s purchased during Jan, 2007. The life of new battery was around two years.

The original one was upto 23000 miles and around 2 years.
The 2nd one was upto 18,000 miles and around 2 years.
The 3rd one was upto 20,000 miles and only 1 years and 4 month.
The original one and second battery are compact size.
The third one is Mazda high-performance battery (regular size).
The fourth one is same as the third one.

The mileage of my mazda 6s was only 61500 miles with 3 dead batteries. I spend around $70-490 for the 2nd one. I spend $165 for third one. The 4th new one is free.

Did someone install interstate battery in first gen of mazda6? How is it and how long for replacement? Which brand of battery is best for mazda6?

Brand won't matter much; the battery in the 6 gets zero airflow. It essentially sits and cooks. Total dumb ass design from Mazda.

How many you had before? I heard interstate brand is best one.