Dubleup power bank review – The credit card sized battery for your phone

The Dublep is a tiny power bank that will help you extend the battery life of your phone. It can’t store a huge amount of charge but its small size means it will easily fit into your pocket making it a great choice for everyday use. It is available through a Kickstarter project launched on March 9 2017, with an early bird offer for the first 6000 backers.

Smartphone battery life is no joke, if you want to use your phone for anything at all you’re going to need to charge it more than once a day. It’s frustrating and a pain, but it’s a fact of life unless you want to carry around a phone with a huge battery strapped to the back.

There are options for power banks if you want to recharge your phone away from a socket, but these are often bulky and unless you’re carrying around a bag, far too big for everyday use. This is the problem the Dubleup power bank aims to solve, offering enough power to extend a smartphone’s battery life, using a battery the size of a credit card that will fit into any pocket.

Dubleup power bank reviewDesign

First things first, while it is the size of a credit card from the top down, it is definitely not the width of a credit card. This isn’t something you’re going to be able to slip into your wallet and not notice the difference. Saying that, it is incredibly small and light for a power bank and it is very pocket-friendly. It is available in black, silver or gold.

While it probably is possible to cram into a wallet we took to just putting it in our pocket during testing. It doesn’t add a lot of bulk and as it is smooth, without any protruding parts, making it comfortable sharing a pocket with a wallet or your phone.

When you need to use it a micro-USB connector, or lightning if you have the iPhone version, pops out of the body and is held on by a small wire. This makes it easy to use without sacrificing the smooth, card-like design of the battery. It also has a charging slot on the side for recharging the power bank when drained.

Dubleup chargerLike most power banks it is not complicated to use. All you need to do is connect it to your phone and then press the small circular button on the back. As well as turning the battery on, it will also give you an indication of how much charge is left using 3 LEDs, which also are helpful when charging the device – showing you how far it has charged and when it is done.

The capacity of the Dubleup is 1280 mAh which for its size is good, although compared with a lot of power banks this isn’t very much. With bigger and bigger phones coming with larger and larger batteries don’t expect the Dubleup to totally refill your battery – it’s very much for a quick top up to tide you over until you can get to a charger. To put it into perspective the iPhone 7 has a 1960 mAh battery and the Samsung Galaxy S7 has a 3000 mAh battery.


Available as a Kickstarter project, the first 6000 backers will be able to get a Dubleup for $50 (£39.94) and after that $59 (£47.13). This puts it at the mid-range level of power banks, with quite a few options cheaper that more than match its capacity, if not its portability.


The Dubleup is a fantastic powerbank for its size and it has the convenience to be carried with you everyday, ready for the time you need that little extra boost. While it might not be able to charge your phone 4-times over like some power banks, you will also not need to lug around a heavy brick with you.

If you find yourself often without power, and with only a small amount of pocket space to spare, the Dubleup may be just the power bank you are looking for.

See also: Best portable chargers & power banks

A fantastically small portable charger, but lacks power
Small and slim
Easy to use
Can't fully recharge most phone batteries