Battery Basics

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BATTERY GROUP SIZE
The Battery Council International (BCI) also determines the size group number. The BCI size group number identifies a battery in terms of its width, length, height, terminal design, and other physical features. Automotive manufacturers provide a designated amount of space in the engine compartment to accommodate the battery. Battery companies build batteries of various current-capacity ratings in a variety of sizes and shapes. A replacement guide is used when replacing a battery because the battery must fit into the space provided.