Batteries come in a wide array of sizes and shapes depending on the intended use of the battery. For example, batteries for SUVs are bigger than batteries for motorcycles. Similarly, hearing aid batteries are much smaller than batteries for a remote control.
The size of a battery is typically directly related to the amount of energy stored within it. Larger batteries hold a greater charge for a longer period of time. The size and shape of a battery is also dependent on its intended purpose. Most batteries for consumer electronics, such as mobile phones, are smaller, making the resulting device smaller.