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Battery pack
A single rechargeable storage element is called a secondary element or secondary cell, in contrast to the non-rechargeable (or only very limited) primary cell. The charging process is based on the electrolytic reversal of the chemical reactions that occur during discharge by applying an electrical voltage. Secondary cells - like primary cells and all electrical energy sources - can be connected together to form batteries, either in series connection (to increase the usable electrical voltage) or in parallel connection (to increase the usable capacity or because of their suitability for higher current intensities). Both circuit variants lead to a corresponding increase in the total energy content [product of capacity and voltage, given in watt hours (Wh)] of the arrangement.
For each type of battery, the nominal voltage of the battery cell is determined by the materials used; Since this is too low for most applications, series connection is often used to increase the voltage (see starter battery picture). The capacity and the possible current strength, however, depend on the size. Therefore, connecting several cells in parallel is usually not necessary; Instead, you use a battery with correspondingly large cells.
Sources: Wikipedia
Example of battery