If you're gearing up for the summer festival season, be it Glastonbury, Download, Reading or Leeds, a power bank could prove to be a savvy investment. With all those selfies and snaps, your phone's battery can deplete quickly - but what if we told you that you could get a Belkin power bank for a fiver?

Thanks to TopCashback and Argos, this is entirely possible. The Belkin 10000mAh power bank is currently on sale at Argos for £19.99. However, TopCashback will gift you a free £15 when you sign up - all you need to do then is purchase the power bank through Argos. If you're feeling a bit puzzled we break down how it works later below.

The Belkin power bank works with all models of phones - iPhone, Samsung, Android and more - and can charge up to three devices at once with up to 15W combined from 2 USB-A ports and 1 USB-C port. A USB-A to USB-C cable is included so you can start charging right out of the box.

If you're looking for alternatives, this larger 20000mAh Belkin power bank is available on Amazon for £33.99. You can also go all out with an Anker laptop power bank for £89.99 right here.

The Argos Belkin power bank is compatible with all phone models - iPhone, Samsung, Android and more - and can charge up to three devices simultaneously with up to 15W combined from two USB-A ports and one USB-C port. A USB-A to USB-C cable is included so you can start charging straight away.

It even boasts a fast charge feature so you can ensure you're fully charged just in time for that band you've been eagerly anticipating. And there are some absolutely glowing reviews.

One shopper said: "I bought a month ago for a four-day trip to Disneyland Paris. Great size fits in a small bag and the battery life was great. My teenage daughter always needed to charge the phone, and we didn't have to charge the device until the last day.

Another reviewer added: "I bought this a couple of weeks ago and used it a couple of times, so I don't have a lot to say but it works well and is neat in my handbag, about the same size as a phone, only recharged a couple of times easy to use, and so far all good".

However, some people complained about the charge speed on certain connections. One reviewer added: "Bought this a few weeks ago for my daughter's phone; it charges reasonably fast on the USB-C port, but it snail pace on the USB-A ports. It takes about 4-5 hours to charge from almost empty to fully charged."

To get this deal, follow these simple steps to ensure you get it for the best price possible.

How to get the Belkin power bank for £5

• To claim the new member bonus, new members of TopCashback need to sign up via this link
• Search for Argos and click ‘Get Cashback Now’
• Shop for the Belkin power bank on Argos and checkout as usual
• Cashback will then track and appear in your TopCashback account within seven working days of your purchase

And that's it! You'll receive the cashback in your account and be able to enjoy it without paying full price. If you're new to both Argos and TopCashback, you'll end up paying £4.74 after cashback or £4.82 if you're a returning Argos customer.