noun
a type of battery that can store electrical energy and is used to charge electronic devices
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I always carry a power bank with me in case my phone runs out of battery.
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I need to grab my power bank before we head out, my phone is almost dead.
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I can't believe I forgot my power bank, now I'm stuck with a dead phone.
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In a world where information is power, a power bank is essential to stay connected at all times.