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Cordless tools are mains-independent power tools whose power is supplied with the help of an accumulator. The first cordless tool was a cordless screwdriver with a pistol grip, invented by Alonzo G. Decker, an American entrepreneur who patented the invention in 1917. In 1961 Black & Decker launched the world's first cordless drill. It was operated with built-in nickel-cadmium cells. A cordless grass trimmer and four other cordless drills followed in 1962. Cordless devices with sufficient power and variable speed have been on the market since 2000. An important parameter is the capacity of the battery, measured in ampere-hours (Ah). Multiplied by the operating voltage (volts) results in the stored energy and thus the theoretically possible operating time per battery charge. Due to the constant improvement of battery technology and the associated increase in performance and operating time, battery tools now have a large share in the sale of power tools. The most important parameters in battery technology are: A = amps = electrical current Ah = ampere hour = nominal charge or electrical charge / capacity V = volts = electrical voltage Wh = watt hours = energy storage capacity of a battery. Formula: Ah x V = Wh. Example: 2Ah x 24V = 48Wh