The telescope, its electronics, and sensors are powered with a rechargeable internal battery that can be replaced in case of malfunction or permanent damage. We recommend you fully charge your eVscope before your first observation. The eVscope’s battery lasts up to 10 hours, whilst the eQuinox's battery - up to 12.
You can also use your telescope while its battery is charging. The charging time can vary from 6.5 hours (OFF mode) to 8 hours (while operating). To charge the battery, you have to use a USB-C charger (check if it's fully connected, sometimes, you'll hear a click when you'll connect it).
The LED will be blue and it will go from six flashes to none. Flashes decrease as the battery gets more charged. In the end, the LED will stay blue with no flash. That's how you know your battery is fully charged. Also, the app will show a full battery icon (eVscope section).
You can absolutely use a power bank to charge your Unistellar telescope. Any would do provided it's USB 5V, we recommend those delivering at least 2A. 2000mAh gives approximately +1hour. Also, please use a good quality charging cable.