Some products solve a problem you already know you have. Others make you realize you had the problem all along. This portable battery falls into the second category. At first glance, it looks like a sleek, compact power bank. Then you notice what is built into it: Apple Watch charging, USB-C output, a USB-C port, Lightning output, and a kickstand. Suddenly, it starts looking like much more than a battery.It is the kind of accessory that can move with you throughout the day.