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These will be heavy, however, so don’t expect to carry them in a pocket. (Remember that you can’t take anything higher than 27,000mAh (100Wh) on a plane without the airline’s approval.) One sought after feature is an LCD screen that gives an exact readout of how much capacity remains (using a four-LED system on higher-capacity banks can be misleading), but you might also want to look for waterproofing and ruggedising, a solar panel that can charge the bank away from home, and integrated LED torches and lanyards. You may pay extra for these features.
Ports & Performance Consider not only the connectors themselves – Micro-USB, USB-C, Lightning and now even full-blown AC adaptors – but also the number of those connectors. How many devices do you need to charge at once?. If your phone supports Quick Charge, look for a power bank that also supports the standard.
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As a general rule, 5W (5V, 1A) is slow, 10W (5V, 2A) is fast, and anything higher than this is excellent. Don’t be fooled by clever marketing: the claimed intelligent technology that optimises the amount of power delivered to your device is really useful only when you’re sharing the bank’s maximum output between several connected devices, because your phone will draw only the charge it requires. Some devices, such as laptops, require more powerful ‘USB PD’ (power delivery, which can deliver up to 100W) chargers – see our separate guide to laptop power banks. Remember that speed is important on the output but also the input – most power banks aren’t sold with chargers, so if you want to make maximum use of a fast input be sure to pair it with a similarly specced charger. Passthrough charging Remember that eventually your power bank will run dry, and when that happens you’ll need to charge it as well as the device you were previously using it to charge.
The best power banks support passthrough charging, which means they can be charged at the same time as you any devices connected to their outputs, requiring only one mains power outlet and minimal faffing around with adaptors. Best power bank reviews 1. Xiaomi Mi Pro Power Bank 10,000mAh Now that Xiaomi’s power banks are officially available in the UK there is nothing better. We love the Xiaomi Pro Power Bank, but it’s currently out of stock at Amazon. There are some other options, as we’ll outline below. If you can find it the Pro’s design is something special, super-thin at 12.58mm and clad in tough-feeling yet premium-looking matte-finish aluminium, in rose gold or space grey.
It looks a lot more expensive than it is, and stands apart from a sea of boring black plastic power banks. Roughly 1.5- to 2 times thicker than most smartphones it’s a similar width but shorter, making it a great fit in the pocket. Its rounded edges make the Pro Power Bank feel great in the hand, too. Xiaomi claims you’ll see around 7,100mAh available to your devices, which is good for two- to three full charges of your phone. Charging is incredibly fast, supporting 18W on both input (USB-C) and output, and the Mi Pro Power Bank also supports passthrough charging. With a compatible charger you could see this power bank go from 0- to 100 percent in just 3.5 hours.
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A Micro-USB cable with attached USB-C adaptor is supplied in the box. If you haven’t got around to upgrading your tech to USB-C just yet, there’s also a Micro-USB version of Xiaomi’s 10,000mAh Power Bank. The Mi Power Bank 2 is available from Amazon for £20.33 and looks almost identical, with the same slick aluminium housing. It’s a fraction thicker, at 14.1mm, and can also deliver an 18W output, but the input is rated at 15W and the actual output is 6,900mAh. Xiaomi also stocks this power bank in 5,000mAh and 20,000mAh capacities, available for £19.86 and £39.99 respectively.
All three of these power banks support a low-charging mode suitable for fitness trackers and other low-power tech. Simply double-press the power button to activate. 2.
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