Whereas charging of batteries usually take hours, ultracapacitors can be charged in seconds.

The figure depicts a portable, handheld power drill with its attached powersupply unit, in which ultracapacitors, rather than batteries, are used to store energy. This ultracapacitor-powered drill is a product of continuing efforts to develop the technological discipline known as hybrid power management (HPM), which is oriented toward integration of diverse electric energy-generating, energy- storing, and energy-consuming devices in optimal configurations.