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Last updated: 12 March 2019

The battery life of your smartphone is under a lot of extra strain from apps, social media, music streaming and online video – a power bank will help keep your phone charged throughout the day.

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We test power banks designed to keep even the most power-hungry smartphones kicking day and night. Our detailed test reveals:

  • the number of times they can charge your phone before they need charging
  • approximate charge time
  • approximate portable battery recharge time
  • size, weight and which models can fit in your pocket.

Our interactive comparison table shows the number of devices each power bank can simultaneously charge, whether they can power a tablet, laptop and Nintendo Switch, and other useful features and functions such as auto on/off settings, fast charge and USB-C output.

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List of brands we tested in this review.

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Weight (g)

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Without any cables or packaging.

enter value/s in increments of 1 between 170 and 1018

Test results

Performance score

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Based on the number of times each battery charged a test phone to 80%.

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Multiple device score

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Refers to the power bank's ability to charge multiple devices at once, if more than one port is available. Higher scoring models showed a limited drop in charging performance when two or more devices were plugged in. This does not contribute to the overall score.

enter value/s in increments of 1 between 0 and 0

Display score

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Takes into account the position of the display on the unit and how easy it is to see and understand at a glance.

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Features

Can charge a tablet

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If the power bank could charge a tablet via USB.

Can power a laptop via USB-C

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We connected USB-C enabled power banks to USB-C laptops to determine whether they could power the device (not charge it). If the laptop didn't indicate that it was on battery power, then we determined that the power bank on test couldn't power it.

Can power a Nintendo Switch

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We connected USB-C enabled power banks to a Nintendo Switch, to determine whether they could power the device (not charge it). If the Switch didn't indicate that it was on battery power, then we determined that the power bank couldn't power it.

Specifications

Stated capacity (mAh)

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Think of capacity as the fuel for the battery. Most of the latest smartphones have a battery with around 3000mAh, so a 10,000mAh power bank should be able to charge the smartphone up to three times and a 20,000mAh power bank more than six times. Stated capacity is the capacity given by the vendor in milliamp hours (mAh).

enter value/s in increments of 1 between 6000 and 26800

Charge indicator

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Refers to the type of display present on the power bank.

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  • Recommended
  • Overall score
  • Performance score
  • Ease of use score
  • Multiple device score
  • Display score
  • Pocketability guide
  • Usable capacity, measured (mAh)
  • Powerbank charge time (hh:mm)
  • Fastest charging 5V USB port (amps)
  • Slowest charging 5V USB port (amps)
  • Maximum combined output (watts)
  • Can charge a tablet
  • Can power a laptop via USB-C
  • Can power a Nintendo Switch
  • Good points
  • Bad points
  • Brand
  • Model
  • Availability
  • Price
  • Stated capacity (mAh)
  • Number of USB-A ports
  • Number of USB-C ports
  • Battery type
  • Weight (g)
  • Size (mm, H x D x W)
  • Quick charge output
  • Wireless charging
  • Auto switch-on
  • Auto switch-off
  • Over-charge protection
  • Charge indicator
  • Other features
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