Written by Lucinda

How big should the capacity of my power bank be?

A power bank is an indispensable accessory for your smartphone, tablet, or laptop nowadays. But how much capacity and power does your power bank need? In this article, I'll explain how you can calculate how often and how fast a power bank can charge your devices.

How often can a power bank charge my device?

How often you charge your power bank depends on the capacity and the remaining power of the power bank as well as your smartphone. Other than that, the average power bank loses about 20% when charging your smartphone, tablet, or other device.

Calculate yourself

Power bank number of charging times
  1. Capacity of the power bank: ... mAh (minus 20%)
  2. Capacity of the device: ... mAh
  3. Number of charges: Capacity of the power bank (... mAh) / Capacity of the device (... mAh)

Examples:

Power bank calculate charging times

Full power bank:

  • 5000mAh, 20% of which is lost, so 4000mAh
  • Battery capacity of an empty Apple iPhone 6s: 1715mAh
  • Number of charges: 4000mAh / 1715mAh = tot 2,3 keer

Volle powerbank:

  • 15000mAh, 20% of which is lost, so 12000mAh
  • Battery capacity of an empty Apple iPad Air 2: 7340mAh
  • Number of charges: 12000mAh / 7340mAh = tot 1,6 keer

How long does it take to charge my power bank?

The charging time depends on the capacity of the power bank and the current of the adapter. The larger the battery capacity, the longer it takes to fill up. More importantly, about 20% of the input current gets lost when charging. Multiply the amperage with 0.8 to calculate how fast you can charge your power bank.

Calculate yourself

How long power bank charge
  1. Capacity of the power bank: ... mAh
  2. Current of the adapter: ... mA (minus 20%)
  3. Charging time power bank: Capacity of the power bank (... mAh) / Current of the adapter (... mA)

Examples:

Charging the power bank

Capacity of the power bank: 5000mAh

  • Adapter current: 1000mA (1A), 20% of which is lost, so 800mA
  • Charging time power bank: 5000mAh / 800mA = average of 6.25 hours

Capacity of the power bank: 15000mAh

  • Adaper current: 2100mA (2.1A), 20% of which is lost, so 1680mA
  • Charging time power bank: 15000mAh / 1680mA = average of 8.93 hours


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