It can be pretty difficult to get through an active day in the modern world without worrying about your phone battery at some point – everything we do, from navigating to sending messages, drains the battery at least a little. Once you’re no longer afraid of battery life, a charger can be a lifesaver.

However, rather than carrying around a bulky hulk that has enough power to charge your laptop and phone ten times over, why not opt ​​for something small and lightweight that will easily fit into a pocket or purse? That’s exactly the benefit offered by the excellent INIU Power Bank, a 10,000mAh power bank that’s currently available on Amazon for just £21.09, down from £34.99.

The power bank is small and slim, about half the size of an iPhone, but can charge at speeds of up to 22.5W, making for really reliable charging times. Plus, a small display shows how much charge is left, so you always know where you stand. It has enough juice to charge your phone twice, and has two USB-A ports and one USB-C port, so you can charge three devices at once.

However, you can get a better idea of ​​how to use the power bank by looking at the user reviews on the Amazon listing, which has over 16,000 customer reviews with an average rating of 4.6 stars. One satisfied customer wrote: “A great little power bank. Much less bulky than the previous 10,000mAh power bank I had and this one is also fast charging. I can usually fully charge my iPhone at least twice with it. The carrying case that comes with it is great and has enough space for a short cable.”

That’s encouraging, with another user adding: “Charging is incredible and battery life is insanely long before needing to recharge. Small and easy to carry and it even comes with a little case for it!” Meanwhile, a third said: “It charges my phone really quickly and shows the percentage remaining.”

Admittedly, there are some people who are less than keen on a power bank – one user wrote: “I was trying to find a small, tiny power bank that I could carry around to charge a phone in an emergency. This is not it. Really big, really heavy.” This is surprising given the views of others. However, another customer agreed: “When it arrived, it was much heavier than expected and not easy to carry.”

However, other 10,000mAh power banks are generally chunkier – like this Anker 313 Power Bank for £22.99, which is much larger. Another alternative is the much more expensive Nimble Champ 10k portable charger, which is expensive at £64.95 but is similar in size to INIU’s.

Still, it can’t compete with the INIU Power Bank in terms of price – at just £21.09, it’s an absolute bargain. Grab it today and you won’t have to worry about your phone battery for the foreseeable future.