battery
n. countablen. a small object that stores electricity to power things like phones, toys, or cars. You use it when you need energy for a device that is not plugged into a wall.
n. a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy. It may also refer to a series of similar items grouped together, such as artillery or musical percussion.
My phone is dead because the battery is empty.
The remote control stopped working, so I need to replace the old batteries with new ones.
Engineers are working to develop a high-capacity battery that can store enough renewable energy to power an entire city during the night.
Countable when referring to the physical power cell; often used in the plural ('batteries') for small electronics.
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assault and battery
The combination of two violent crimes: assault (the threat of violence) and battery (physical violence). This legal distinction exists only in jurisdictions that distinguish assault as threatened violence rather than actual violence.
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change one's battery
To alter the direction of attacking; to take a new approach to try to achieve an objective.