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Tronsmart Trim 10,000mAh Power Bank Tronsmart’s Trim is an interesting power bank, shipping with what appears to be a lanyard but actually unclips to reveal a cable that is Micro-USB at one end and a flat USB-A at the other, making it easy to refill the bank wherever you are. What’s missing from the box is a USB-C cable, which is necessary if you want to take advantage of its 18W Power Delivery port. This is on both the input and output, which means recharging the bank will be much faster when you do so over USB-C rather than 10W Micro-USB. You can also charge your device while charging the bank. It’s worth pointing out that the full-size USB port is also capable of delivering 18W to devices that support it, while VoltIQ ensures it delivers the fastest possible charging speed for whatever you’ve got plugged into it. You can use both the USB-A and USB-C ports at once, but the device’s maximum output is 18W so neither will run at full-speed. The Tronsmart Trim has a really nice design, rectangular but slim, at 144x70x12mm, and it weighs just 194g. The black casing has a matt finish that feels lovely in the hand (and not at all slippery), while a rose gold metal trim is seen around the edges.

There’s 10,000mAh of juice inside the bank, which should equate to around 6,500mAh usable power. It’s available now from Amazon at £22.99, and ships with an 18-month warranty. 4. Anker PowerCore Speed 10000 QC The PowerCore Speed QC from Anker is a very close third to the Zendure A2 and Mi Pro Power Bank. With a 10,000mAh capacity (expect around 6,500mAh to be available to your device) it’s got enough juice to quickly charge a phone several times, yet it’s compact enough to fit in a pocket – the perfect combination. Anker claims it’s 27 percent smaller than comparable banks at this capacity, and it weighs just 198g.

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It’s a fairly simple looking black plastic power bank, but it feels well made and, reassuringly, comes from Anker – a brand well known in the power bank world – with an 18-month warranty. In exchange for this minimal design you get a very reasonable price, £27.99/$34.99 from Amazon at the time of writing. There’s just a single input and single output, with four blue LEDs on top to show how much power remains.

So it’s nothing fancy, but the PowerCore Speed is functional and intuitive in use. The Speed 10000 QC is an upgraded version of the PowerCore 10000, and you’ll notice it has a blue plastic prong inside its full-size USB output to indicate the improved performance. It supports Quick Charge 3.0, Voltage Boost and PowerIQ, and these three performance technologies combined in essence ensure that any connected device is charged in the shortest amount of time possible. If you don’t have a Quick Charge-enabled phone you’ll still get 12W from this output, and the input is also fast to refill the bank at 10W. Unfortunately there’s no support for passthrough charging, which would have been the icing on the cake.

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Also with this version is a bundled mesh carry case, which is handy for keeping together the power bank and necessary cables. Overall a fantastic buy. Learn more in our full Anker PowerCore Speed 10000 QC review. 5. Anker PowerCore II 10,000 Slim A variation on the PowerCore Speed at the top of this chart with a longer, slimmer, rectangular body and PowerIQ 2.0 technology that allows it to offer 18W fast charging from a single chipset, the PowerCore II 10000 Slim is actually a couple of pounds cheaper at £25.99/$35.99 at Amazon at the time of writing. Like that model it has an efficiency rating around 65 percent, so it’s good for charging most Android phones twice and iPhones three times.

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