Things to keep in mind , Which is the best brand powerbank. Working out how many times a power bank will charge your phone depends on more than the mAh rating on the packaging. No power bank is 100 percent energy-efficient, with every portable charger losing power through voltage conversion and heat generated. The industry standard for energy efficiency is between 60- and 70 percent, and if it doesn't expressly state otherwise on the packaging this is likely what you'll get. But some of the best power banks can offer as high as 90 percent energy efficiency, which equates to more full charges for your phone.
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