Oh, another tidbit of understanding has to do with the size of the battery. Volume grows with the cube but surface area grows with the square. Therefore, a smal

Oh, another tidbit of understanding has to do with the size of the battery. Volume grows with the cube but surface area grows with the square. Therefore, a smaller battery would be easier to cool or may not need any cooling. A larger battery would need it. An EV car battery is a magnitudes larger than your cell phone battery. It is supposedly why elephants have big ears. Cooling.