The capacity of lithium - ion energy storage batteries is a critical parameter. It is measured in ampere - hours (Ah) or milliampere - hours (mAh) for smaller batteries. The capacity indicates the amount of electrical charge that the battery can store and deliver. A higher - capacity battery can power a device for a longer period or supply more energy to a system.

　　For example, in a smartphone, a battery with a capacity of 3000 mAh can provide power for a certain number of hours of normal usage, including activities like making calls, browsing the internet, and using various apps. If the phone's power consumption is 100 mA on average, the battery can theoretically last for about 30 hours. However, in real - world scenarios, factors such as screen brightness, background processes, and the type of applications running can significantly affect the actual battery life.

　　In larger - scale applications, such as electric vehicles, the capacity is much higher, often measured in kilowatt - hours (kWh). An electric vehicle with a 60 kWh battery pack can travel a certain distance depending on its energy efficiency. If the vehicle consumes 15 kWh per 100 kilometers, it can travel approximately 400 kilometers on a full charge. The capacity of a lithium - ion battery is determined by factors such as the amount and quality of the active materials in the electrodes, the cell design, and the manufacturing process. Over time, the battery's capacity will gradually degrade due to factors like repeated charging and discharging cycles, temperature, and storage conditions. This degradation is a key consideration when choosing a battery for long - term applications, as it will affect the performance and usability of the device or system powered by the battery.

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