Last Updated
：2025/11/23
battery booster
（ plural ）
Quizzes for review
A portable battery, fitted with cables and a charger, used to charge a dead battery, especially in a car.
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battery booster
I kept a battery booster in the trunk in case the car wouldn't start on cold mornings.
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I kept a battery booster in the trunk in case the car wouldn't start on cold mornings.
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