Watt-Hour, or Wh, is a more accurate unit to show the power capacity than Amp-. Hour (Ah) that was used before. For example,

**4000 mAh**at 11.1V**means**the battery capacity is**4000 mAh**x 11.1V = 44.4 Watt-hour (Wh).**4000 mAh**at 14.8V**means**the battery capacity is**4000mAh**x 14.8V = 59.2 Watt-hour (Wh).Accordingly, how many phone charges is 10000mah?

Generally speaking, a good rule of thumb is to divide the mAh of 10000mAh power bank by the mAh of your device battery. So a 10000mAh power bank can “theoretically” charge an iPhone 4s plus from 1-100%

**4.1**times (**10000 / 1810**= 5.5). --iphone6/6s battery capacity is**1810**mAh.How long is 20000 mAh?

Your power bank is 20000mAh or in simple terms 20Ah. That means your poer bank can give 2Amp for

**10 hours**(2*10 = 20) or 1Amps for**20 hours**(1*20 = 20). The hour value might change based on the C rating of the battery. No how much time will you need to charge it depends on the charging current.How many mAh is the iPhone 6?

This is compared to

**2915 mAH**battery in the iPhone 6 Plus, about a 5% reduction. This mirrors the already-known battery capacity reduction in the 4.7 inch iPhone 6s, which has a 1715 mAH battery. This is also 5% smaller than the**1810 mAH**battery in the iPhone 6.