A standard electric vehicle battery is measured in inches (9 x 12 x 7). The car battery market is well established and at the present time, size is inextricably tied to capacity. A real issue is power for acceleration and maintaining speeds above 10-15 mph which require lots of amperage (Amps). So, in the case of electric cars, more capacity means more amps and more amps require more electric vehicle batteries. This is where size plays a part; it’s about the space needed for sufficient battery storage.
For hybrids vehicles, the battery size changes. Although they are a lot larger than electric vehicles, it is measured in number of cells. For instance, the battery pack of the second generation Toyota Prius consists of 28 Panasonic prismatic nickel metal hydride modules—each containing six 1.2 volt cells—connected in series to produce a nominal voltage of 201.6 volts. The total number of cells is 168, compared with 228 cells packaged in 38 modules in the first generation Prius. The pack is positioned behind the back seat.
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