Do you prefer a battery case or a power bank?
So, if you are an avid smartphone user or one that takes trips regularly, you probably have some sort of portable battery at the ready. There are two main choices to go for — a powerbank, which can get quite massive; or a battery case, which protects your phone while charging it and doesn't require you to remember that one extra item at all times — it's just connected to your smartphone.
So, which one of these do you use? Or are you yet to buy one?