Power Banks

Why a Power Bank Does Not Deliver Its Full Rated Capacity to Your Phone

A 10,000 mAh power bank might seem as though it should recharge a phone with a 5,000 mAh battery exactly twice. In real use, it usually cannot. That does not automatically mean the power bank is defective or that its capacity rating is false. The apparent mismatch comes from comparing two battery capacities without accounting for voltage, energy conversion, and the power consumed while charging. A power bank stores energy in its internal battery, converts that energy into a form the phone can accept, and the phone converts it again as it charges its own battery. Each stage has limits and losses.