You know how it is: you're on the road and your iPhone is almost empty, but there's no power outlet anywhere. A power bank is the perfect solution for this, but how much capacity do you need to charge your iPhone? Is 5000 mAh enough or should you opt for a power bank with 10,000 mAh or even 20,000 mAh? In this blog we explain exactly how much capacity your power bank needs to have to charge your iPhone.