The battery consists of 9 Leiden jars. They are all closed with wooden lids, in which brass rods ended with knobs are mounted. Each of them is connected to the other ones by means of brass rods. The Leiden jar is the oldest form of a capacitor, a device used to store electrical charges. The jars connected in a battery allowed for increasing the amount of the charge stored. This device was independently invented in 1745 by Pieter van Musschenbroek (1692–1761), a professor at Leiden University (hence the name of the device), and Ewald Jürgen von Kleist (1700–1748), a lawyer and scholar working in Kamień Pomorski. The jar could be electrically charged by contacting the rod with an energised body. Time and place of creation: 19th century, England Inventory number: 17072; 2187/V Museum: Jagiellonian University Museum Collegium Maius https://muzea.malopolska.pl/en/objects-list/2765 Digitalisation: Digitalisation: RDW MIC, Virtual Małopolska project