Best Power Banks 2017/2018: Top Power Bank Reviews & Buying Advice

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Want more help deciding which is best for you? Read our buying advice for the Best Power Banks

1. Zendure A2

4. CHJGD UltraCompact Power Bank

CHJGD UltraCompact Power Bank

5. Anker PowerCore II 10,000 Slim

Anker PowerCore II 10,000 Slim

6. Moshi IonSlim 5K

Moshi IonSlim 5K

7. Zendure A3

Zendure A3

8. DXPower Armor DX0001

DXPower Armor DX0001

9. Flux Card

Flux Card

How to choose the best power bank for you

Power banks come in three sizes: small lipstick-style devices that might charge your phone once and cost about a tenner; compact units with a mAh rating of between 5,000- and 10,000mAh that will offer two- or three full charges and might cost around £20; and high-capacity devices that will keep you going for days on end away from mains power and that will set you back anywhere between £25 and £100. 

If you’re wanting to take a power bank on a plane, know that the maximum capacity you can take in hand luggage is 100W, or around 27,000mAh. 

Whatever its stated capacity, remember that not all of that juice is available for charging. The typical energy efficiency is between 60- and 70 percent, but some go as high as 90 percent – where this is the case it will be mentioned in the product specs. If it’s not stated, assume around 60 percent efficiency rating and consider anything on top of that a bonus.

We test lots of power banks, and in this group test have given examples of some of our favourites, but there are so many available on the market and from so many different vendors that you’re better off going into this knowing what features you want to look for and then choosing accordingly.

Do you need multiple outputs? Do you want a USB-C or Lightning input/output, or an AC outlet? (The latter are significantly more expensive.)

Would you benefit from passthrough charging (also known as charge-through technology)? This allows you to simultaneously charge the power bank and a connected device, thereby freeing up power outlets in your home.

Do you want an LCD screen that can give you an exact read-out of what capacity remains or are you happy with LEDs?

Do you need a rugged or waterproof casing? And if you’re going away from civilisation would you benefit from a built-in LED flashlight and a built-in solar panel? 

You might think living in the UK our grey climate would rule out the use of such a device, but even in cloudy conditions these devices can draw some solar power.

Power banks and charging speed

One of the most confusing things for many people when it comes to working out which power bank they should buy is figuring out how fast it is, or rather how fast it should be.

If it’s a small device that will fit in your pocket along with your phone then you might not be so worried about how fast it can recharge your handset, but speed is particularly important when you want to charge a laptop or tablet, which may refuse to charge from slower outputs. 

Confusingly, the term ‘fast-charging’ is thrown around a lot within marketing, and it doesn’t really mean anything. The minimum you’ll see is 5W, and we would not recommend this. Although some phones are still sold with 5W chargers, most devices will accept more than this.

In our view anything below 10W should be considered standard (read slow), and anything above 10W fast. Then you also have various Quick Charge standards – all of which are backward-compatible – which will get you up to 18W, but only on compatible devices.

If it’s a high-capacity power bank then you should look for ‘fast-charging’ inputs as well as outputs. Do bear in mind, though, that in order to refill a power bank at 18W you will need a mains adaptor that is capable of delivering 18W to it.

Increasingly power banks feature clever technology called PowerIQ or similar. This allows the bank to recognise the type of device you have connected and deliver the optimum amount of power. 

The input rating is key when it comes to recharging the bank – the higher is this figure the more quickly it will charge. You’ll see a figure in Amps, and you multiply this number by the voltage (5V for USB) to find the rating in Watts.

You can use any output to charge any USB device – it will draw only the power it needs.

If a power bank has several outputs the maximum total output capacity is key, since it may not be able to simultaneously support each at full power.

What is Power Delivery?

A fairly new standard is Power Delivery, often abbreviated to PD. Most laptops, some tablets, and power-hungry devices such as the Nintendo Switch will not charge over a standard USB connection – it must support PD.

All you really need to know about Power Delivery is that it has the potential to deliver a lot more power – up to 100W. You’ll find mains adaptors offering 29W, 45W, 65W and so forth, all of which are PD chargers. The same is true of power banks.

See our pick of the Best Power Bank Deals and Best power banks for Nintendo Switch. Plus: How to charge your smartphone or tablet faster

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