Ask any frequent flyer and they’ll tell you that among their most essential gadgets is one of the best power banks – none of us ever want to be caught in a situation where our phone, headphones, iPad or Bluetooth speaker is running out of juice, and these portable batteries are the best way to keep your devices fully charged when you’re on the go. They’re not just for travellers too, they are invaluable for all your recharging needs when you’re not near a plug.

It's easy to get used to being a couple of feet away from a power cable or wireless charging pad on those days when you're working from home. Since the appearance of Apple MagSafe magnetic wireless charging, the excellent experience made Apple also launch a series of accessories, of which the hottest magnetic wireless power bank with short battery life and high price. Finally, it is important to consider the price. Magnetic power banks come in a variety of prices and it is important to find one that fits your budget. Additionally, it is important to make sure the power bank you select is from a reputable brand and comes with a warranty. ConclusionA strong wireless charger that supplies your phone with up to two recharges and can recharge two devices simultaneously. Step up from the budget power banks to the mighty Juice Powerbank Max and you get a much more capable mobile charger, with a 20,000mAh capacity and a 20W USB PD output over USB-C. We measured the USB-A output at nearly 15W in our tests, which recharged our smartphone by 18% in 15 minutes. With USB-C, that output rose to just over 19W, which was good for a 22% recharge in 15 minutes. That’s not bad at all for an affordable power bank, and we also found it usable for charging tablets and even a Chromebook laptop, albeit at a slower-than-usual speed. Ports: Different devices have different charging ports, and your power bank should be compatible with them. Look for power banks with the right ports, such as Lightning or USB-C, to ensure seamless charging for all your devices. Having multiple ports is a bonus, allowing you to charge multiple gadgets simultaneously. This isn’t the Power Delivery speeds we’re becoming increasingly familiar with today, but it’s plenty fast for charging a phone (or multiple phones).

The use of USB-C for the single input/output port is a little weird given the target market, and you’ll need a fast USB-C charger and a USB-C to Lightning cable to make the most of the device. What’s more, the wired charging isn’t super-speedy; our Android test smartphone only recovered by 11% from a 15-minute charge. But if you’re an iPhone user looking for a light and convenient portable charger, the Anker 622 is almost perfect for the role. EnergyCell’s portable charger is as basic as power banks get, with just a micro-USB input, a USB-A output and no support for any fast-charging standards. What’s more, it’s slow. The USB-A output is specified as 10W, but in our tests we measured the output at between 7W and 9W depending on the phone. A 15-minute charge only raised the level on our test smartphone by 7%.It’s worth getting a power bank with both ports as USB-C becomes more commonplace, and it’s the port that is faster and gaining popularity. When it comes to the power bank output, you’ll want to look for ones that can output at least 20W via USB-C, as this is the fastest speed to recharge an iPhone. Wireless charging Dimensions: 9.91 x 6.4 x 1.65 cm | Weight: 173g | Capacity: 5,000mAh | Ports: USB-C (input and output) and wireless charging If you're prone to forgetting your cable, some power banks can recharge your phone wirelessly. You'll just need to place the smartphone on the charger and press a button to start – you may have to reposition it to get perfect alignment, although there are magnetic models (more on those below) for the latest iPhones that'll always snap into the correct position. Magnetic power banks At the other end of the scale, if you need to charge a low-power device such as a smartwatch or a pair of wireless earbuds, look out for a power bank that is certified for low-power devices. Many of those that are not will simply cut out when you try to charge these devices, because they aren’t able to detect a significant drain on the battery. We like wireless charging as a fuss-free way to refuel smartphones and earbuds, although it’s worth noting that it’s slower than the traditional wired approach.