Car battery comes with differ ampere-hour (AH) or capacity. The bigger the capacity rating the bigger the size of the battery. There is no really strict rule that it must be replace by a same capacity battery. First look at the size of your battery bracket, usually there is space for a bigger battery. 12V 35 Ah to 45 Ah are quite common to Jap models. Bigger the battery will last longer or if you have install powerful amplifier in your car.
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