26. Why does the side indicator (coax) of the Q5s still light up in red after fully charged in power off status?

stop working at that time. However, the red LED indicator is also controlled by the USB charge module, so it will still light up.

You can remove the USB power supply and the indicator will turn off after that. If you would like to check the battery level, you can hold the input button for about 2 seconds after turning on the Q5s. If the 4 side indicators light up at the same time, it means the charging is completed.