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Last updated: 18 April 2018

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 18 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, included USB cord length, as well as useful features and functions such as auto on/off settings and inbuilt torches. 

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List of brands we tested in this review.


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Recommended retail at time of purchase.

enter value/s in increments of 1 between 25 and 169

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Weight (g)

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Weight of each power bank was recorded without any cables or packaging.

enter value/s in increments of 1 between 188 and 1018

Test results

Display score

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Takes into account the position of the display on the unit (40%) and how easy it is to see and understand at a glance (60%).

enter value/s in increments of 1 between 54 and 98

Performance score

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Based on a charging score that comprises how many times our test phone could be charged (60%) and the discrepancy between theoretical and actual charges (40%), and how long it took the power bank (on average) to charge our phone (50%).

enter value/s in increments of 1 between 44 and 79


Cord length (mm)

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The length of the supplied USB cable, as measured, not taking into account the plugs.

enter value/s in increments of 1 between 100 and 740

Number of charging outputs

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Number of USB output ports are present for charging devices.

Charge indicator

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



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Whether or not there is a built in LED light.

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Included in this review

Members-only access
  • Recommended
  • Overall score
  • Performance score
  • Ease of use score
  • Display score
  • Pocketability score
  • Average time to charge a phone (hh:mm)
  • Average number of times phone could be charged
  • Average speed of charge (tested, mA)
  • Power bank charge time (hh:mm)
  • Fastest charging 5V USB port (amps)
  • Slowest charging 5V USB port (amps)
  • Maximum combined output (amps)
  • Good points
  • Bad points
  • Brand
  • Availability
  • Model
  • Price
  • Stated capacity (mAh)
  • Battery type
  • Weight (g)
  • Size (mm, H x D x W)
  • Output voltage
  • Number of charging outputs
  • Quick charge output
  • Other ports
  • Cord length (mm)
  • Torch
  • Auto switch-on
  • Auto switch-off
  • Over-charge protection
  • Charge indicator
  • Can charge a Windows tablet
  • Other features
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