Well, from the product page, the pocket screen actually has more battery capacity than the armband. In fact, the screen can be used as a on-the-go charging stat

Well, from the product page, the pocket screen actually has more battery capacity than the armband. In fact, the screen can be used as a on-the-go charging station for the armband. Personally, I don't know how I feel about this. Their battery benchmarks are assuming you're going to use the pocket screen to charge the hub, but I don't necessarily want to be tethered to this pocket screen either.