Battery (noun)

1. A set of one or more electrical cells that convert chemical energy into electricity.
2. A device that stores electrical energy and supplies it to an electrical device.
3. A group of artillery pieces or a group of similar military equipment.
4. An unlawful physical attack on someone.

Origin:

From the middle english word "baterie" meaning "an array of artillery".

Examples:

1. He replaced the battery in his car.
2. The battery in my phone is running low.
3. The battery of artillery bombarded the enemy's position.
4. He was charged with battery for hitting his partner.
5. A battery is a set of one or more electrical cells that convert chemical energy into electricity.