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The phrase "as a battery" is correct and usable in written English.
It can be used in contexts where you are comparing something to a battery, often in terms of energy, power, or functionality.
Example: "The new smartphone is designed to function as a battery, providing extended power to other devices."
Alternatives: "like a battery" or "in the role of a battery".
Exact(52)
Which is impressive — 4G is famous as a battery hog.
Some have said a Tesla is not so much a car as a battery on wheels.
When the two electrodes are immersed in a solution, they act as a battery.
The unit can also be used as a battery backup system for all individual needs.
Walter Benjamin describes this conservation of idleness well: "To store time as a battery stores energy: the flâneur".
Videos can be viewed by plugging into a computer using the included U.S.B. cable, which doubles as a battery charger.
Similar(8)
Replacing the filter was as easy as changing a battery.
Each Patriot missile costs as much as $2 million; a battery can cost $225 million.
He ended up rolling one as thick as a double-A battery.
As a battery-maker Tesla is also moving fast.
Some 1958-60 Buick, Oldsmobile and Pontiac models offered a removable radio that doubled as a battery-operated portable.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com