Specific power is a key metric in energy storage systems, indicating the rate at which power can be delivered per unit mass, typically measured in watts per kilogram (W/kg). It's crucial for applications requiring quick energy release, such as acceleration in electric vehicles or peak power demand in electronic devices. Higher specific power means faster energy delivery. For example, supercapacitors have higher specific power than batteries, making them ideal for short-term energy bursts. Balancing specific power with specific energy is vital for optimizing performance in energy storage technologies.