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Discover LudwigThe phrase "a battery" is correct and usable in written English.
It can be used when referring to a single unit of a device that stores energy, typically for powering electronic devices or vehicles.
Example: "I need to buy a new battery for my camera because the old one no longer holds a charge."
Alternatives: "one battery" or "a power cell".
Dictionary
a battery
noun
A battery used to heat the filament or cathode heaters of electron tubes.
synonyms
Exact(56)
A battery.
A battery runs out.
Next came wiring a battery.
As in a battery.
Facebook app is such a battery killer.
A battery start-up flows toward introduction.
"Like a battery," Ms. Noel added.
Similar(4)
His favorite is a battery-operated drill.
How about a battery-operated hearing aid?
A battery-powered radio.
Purchase a battery-operated radio or television.
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