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A power bank keeps your phone going on long days out, while travelling or during a power cut. Capacity is shown in mAh: around 10,000 mAh charges most phones about twice, while 20,000 mAh or more suits tablets or several devices. For quicker charging, look for USB-C with Power Delivery and check the output in watts matches what your phone or laptop can take. A built-in cable or a display showing the remaining charge is handy. Airlines usually allow power banks in hand luggage only, with limits on size, so check your airline before you fly. Buy from known brands and retailers.

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