With the summer upon us there is no excuse not to peel your backside of the sofa, switch off the games console and step out into the sun. God it’s bright out there, but the hair loss from lack of vitamin D just isn’t worth it! Don’t forget to smother your pasty skin in sun cream if it’s the first time you have been out this year.

So, now you are out in the big bad world, what are you meant to do with yourself? Fear not, man’s second greatest invention after the Xbox, the Smartphone, has all your entertainment needs in the palm of your hand, and you don’t have to waste your time looking at nature, friends or family (yawn). But now a new horror: 3% battery and you are a good 30-minutes from the safety of home and a charger! Enter the GP PowerBank, superhero cape flapping in the wind, with 15000mAh of power ready to save the day.

The battery capacity roughly translates into how many times it can recharge your device. The iPhone X has a battery capacity of 2,716mAh and a Samsung Galaxy S9 has a 3,000mAh battery. This means the GP PowerBank can hold enough juice to fully recharge both devices up to 5 times before it needs to be recharged itself. This is a theoretical estimate and depends on several variables, for example whether you are using the phone at the same time whilst charging. For larger devices, tablets for example, a good rule of thumb is to ensure the capacity of your device doesn’t exceed 70p of the charger’s capacity.

The GP PowerBank comes with a USB-C and Micro-USB 2-1 charging cable, it is compatible with iOS devices, but you will need to use your own cable. It is a compact little device: 125.5L x 70W x 18Hmm, which fits comfortably in your hand, but it is a bit of a lump at 320g. It requires either Micro-USB or USB-C as an input for charging, and it will take roughly 6.5 hours to receive a full charge off a standard charger. It can charge up to three devices at once with two USB-A ports and a USB-C port.

In test it took 2hours 6mins to fully recharge my phone (Samsung S8) 0-100% and the pack is still showing full charge. There is a button you can press to activate the battery level indicator, each light representing 25%. The included cable is short so if you want to continue using your phone with the charger tucked away in a pocket or bag, you will need to bring a cable. There is no carry or storage case included. The GP Powerbank 15000mAh is a good companion to have at hand that lets you to get a good dose of vitamin D, whilst also allowing you to play Pokemon Go and ignore potential human interaction – excellent! RRP £34.99

3.8 out of 5

Current Cheapest Price

Pro

Compact

15000mAh capacity

Charges up to 3 devices at one time

USB-C and Mirco USB inputs

2-1 cable

Cons

Heavy

No carry case included

Short cable