Batteries are a cheap, small, and relatively safe way of having a portable energy source. There are many types of batteries with different characteristics and uses. Probably many of you heard the terms battery and cell referring to the same. But from a technical perspective, these are different things – a cell is a single unit that houses a single chemical reaction and produces electricity. At the same time, a battery is a pack of cells. Nominal cell voltage and battery voltage For instance, a single AA battery can be called a cell because this is a single unit where a single chemical reaction generates a voltage of 1.5V. Still, car lead-acid battery has six cells producing 2.0V each while all battery produces 12V. The first important thing to remember is that a single cell can produce a specific nominal cell voltage that depends on a chemical reaction. In contrast, the battery voltage is a combined voltage of multiple cells connected in series (or parallel).