With festival season upon us it is easy to forget that sharing all those Insta photos and blasting out tunes back on the campsite will decimate your battery life in a matter of hours, let alone stand a chance of making it through the weekend. Thankfully the Anker PowerCore 20100 is a highly powerful, portable power bank that can recharge the iPhone 7 from 0-100% just shy of seven times and the Galaxy S6 up to five times as well as bring the iPad mini 4 back to life, twice.