Typically, a power bank should be charged for 6-8 hours to reach full capacity. However, it's important to refer to the manufacturer's instructions as charging times can vary between different models and brands. . But a common and frustrating question many users have is: how long does it take to charge a power bank? The answer isn't always straightforward—it depends on several factors, from the mAh capacity to the type of charging input and cable you're using. Brands like VRURC optimize internal circuitry to. . A Portable Power Bank Runtime Calculator is tool designed to estimate the runtime of your power bank based on various input parameters. The core concept is energy conservation.