It's that time of year when a power bank should top everyone’s gadget wishlist. Whether you’ll be spending several hours attempting to keep yourself or the kids entertained as you jet off somewhere hot, or getting washed away at a festival hoping to glean some comfort from trusty smartphone, a power bank is essential for keeping your devices going away from the mains. Also see: Best power banks 2017 We review all sorts of power banks, and while you might imagine there’s not a lot of difference between them you’d be surprised. It’s not just their capacity or how many times you can charge your phone that is important: you should also consider such things as how...
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