Asa result, a 20,000mAh power bank can actually charge a 5,000mAh smartphone around 2.66 times before needing a recharge itself. Of course, this figure will vary according to your GuidesPower bank How many charges does it have? By Shawn Woo Updated: April 14, 2023 420 You can find out how a power bank how many charges for your devices? Is 5000mah, 10,000mah, 15,000 and 20,000 which power bank is right for you? A single charge from your phone battery lasts for a few hours. Witha 10000mAh power bank, you should be able to charge your smartphone up to 2-3 times. The charging time for smartphones typically ranges from 1 to 2 hours. Tablets: Tablets generally have a higher battery capacity than smartphones, around 6000mAh to 10000mAh. CVT5.