Sure smartphones may have plateaued, but that doesn't mean they quality of them is stable either. Low cost foreign brands are popular because they're now good e

Sure smartphones may have plateaued, but that doesn't mean they quality of them is stable either. Low cost foreign brands are popular because they're now good enough for many consumers. But on your point: I have received 3 of the travel batteries you've described as promotional/corporate gifts. They're all junk, and their housing is weak. While I've never used any of them, it wouldn't be such a stretch for me to charge one up as a "back up" battery when I go travelling. (Obviously now I won't.)