I’ve tested so many of the best power banks out there that I’ve started to lose count. From the best wireless chargers to the best solar-powered options , I’ve tried them all, but when it comes to charging my laptop , there’s one I always grab. If you’re anything like me and regularly work abroad or spend days away from a plug, you’ll need a power bank that can actually keep your laptop juiced up. I always look for something with a high capacity, fast charging speeds and a flight-friendly design. Enter Anker’s 25,000mAh power bank . I’ve been using it as my go-to laptop charger for a year now, using it abroad, on conference trips and when working on the train. But at £75, is it actually worth the price? Read more: These are the best laptops, from budget to flagship How I tested (Alex Lee/The Independent) I’ve been testing power banks at The Independent for more than five years. I’ve been chucking Anker’s laptop power bank into my backpack and carry-on since I first reviewed it a year ago.…