Power bank works fine. The free fan seemed to work when I plugged it in to charge (Fan speeds and light worked) so I let it charge, and put the box in the recycle bin for pickup the next morning. However, the CHARGE light was still on. Unplugging the charger showed that the fan would not operate, but plugging the charger in again, it was dead. I disassembled it and did not see any issues. Measured the battery at its leads, and it was only .408V. Without the box, I didn't try to return it. If it seems too good to be true, it probably is!