Power banks are small rechargeable batteries that are useful for recharging small devices like phones and tablets. They are generally small enough to fit in a pocket, and typically have enough battery capacity to recharge a phone's battery 2-3 times.
Power banks can be useful when places to recharge devices aren't always available.
Power banks are distinct from jump packs (which are designed to jump start a car) and portable power stations which are significantly larger in physical size and battery capacity.
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