How to charge a device faster using a Power bank?

In this section, you will learn to identify the specifications in the USB output ports of your power bank, for you to choose the model that satisfies best your device’s charging needs.

As you already know, a power bank can charge most electronic devices with a USB port: cellphone, tablet, iPad, bluetooth headset, ebook reader, fitness tracker, smartwatch… even an E-cigarette or a laptop.

In addition, for the new generation cellphones, fast charging technologies (such as Quick Charge and/or Power Delivery) are also available in the output ports (either USB-A or USB-C) in many power bank models, therefore, we can distinguish 2 different ways to charge our devices:

  • Standard Charge: the output voltage is always 5V, this is the default charge offered by any power bank.
  • Fast Charge: it works with a higher voltage superior to 5V (such as 9V or 12V) to supply more power to the device during the charging process.

Note: The power bank must be compatible with the fast charging protocol implemented on the connected device, otherwise, it will trigger the default charging mode at 5V.

Case study: charging a smartphone with a Power bank

The following image shows the technical specs of model PBD01 by Tronsmart:

power bank tronsmart trim specifications

It can be seen on the label the type of USB output ports: USB-A and USB-C, the range of charging tensions supported: 5V-12V and the maximum current values (A) and power (W) supplied by each port:

  • USB-A Output: DC 5-6V/3A, 6-9V/2A, 9-12V/1.5A (18W)
  • USB-C PD Output: DC 5V/3A, 9V/2A, 12V/1.5A (18W)

Note: although the type C port shows the Power Delivery protocol, we also verified that it supports Quick Charge 3.0.

That is, with this power bank, we can charge devices in both Standard Charge (5V) and QC 3.0/PD Fast Charge through its 2 output ports: USB-A and USB-C.

Being that said, you may come up with the question:

What smartphones can we charge with this power bank?

Let’s see some examples:

Google Pixel 3Xiaomi Mi 5

The Google Pixel 3 has a type C port and fast charging via the Power Delivery (PD) protocol only.

If we connect Pixel 3 to port C of the Tronsmart Trim power bank, its Fast Charge system would be enabled (compatible with PD) and the Pixel 3 will charge in less time than Standard Charge mode.

Instead, if we connect it to the USB-A port of the Tronsmart Trim (by using a USB-A to a USB-C cable), the Google Pixel 3 would charge at 5V (Standard Charge) since this port is compatible with QC 3.0 and the Google Pixel 3 doesn’t support Qualcomm Quick Charge protocol.

The Xiaomi Mi 5 counts with a type C port and fast charging through the Qualcomm Quick Charge (QC 3.0) protocol.

In this case, the Xiaomi Mi 5 may be plugged into the USB-A or the USB-C provided by Tronsmart Trim to be charged via QC 3.0.

Logically, for the USB-C port, we would need a cable with a USB-C connection on both ends.

If my smartphone charges at 1A, could the Power bank damage it?

It will not damage your smartphone: a power bank always provides the current that the connected device needs and, of course, that it can supply (depending on its specifications).

The current (A) that appears in the specifications of a power bank indicates the maximum current that the power bank can supply per port at a determined charging voltage (5V/3A, 9V/2A and 12V/1.5A) but is not the current that is supplied to a device.

Continue reading our guides for more information: