The correct battery size for a BMW 325 series sedan depends on the particular vehicle, including its year, exact model and engine size of the vehicle. There are multiple BMW 325 vehicles such as the 325Ci, 325i and 325iS.
With the appropriate information, an individual may use online tools to find the correct battery size at various stores such as Wal-Mart, AutoZone and O'Reilly Auto Parts. A car battery's group size or BCI number must match, along with cranking amps, cold cranking amps, reserve capacity ratings and amp hours. A battery group size is the standard industry size for car batteries.