How long will a 20,000 mAh power bank typically last?
If you need to charge your phone repeatedly while away from an outlet, a big power bank could be a good investment.
If you need to charge your phone repeatedly while away from an outlet, a big power bank could be a good investment.<p><img src="https://www.engadget.com/img/gallery/how-long-will-a-20000-mah-power-bank-typically-last/intro-1790271761.jpg" /></p>
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