Keeping a battery pack charged is useful when you forget charging it, but it really shouldn't be something that you are required to use on a regular basis just

Keeping a battery pack charged is useful when you forget charging it, but it really shouldn't be something that you are required to use on a regular basis just to make it last throughout the day. It makes little sense to make a phone as thin as possible and then expecting you to carry an additional cable and battery pack, it's just bad design IMHO.