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Battery: everything you need to know


The telescope, its electronics, and its sensors are powered by 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 2’s battery lasts up to 9 hours, whilst the eQuinox's battery - up to 11 hours. Please note that you need to recharge your unit every 2-3 months to avoid battery issues.

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 the official Unistellar 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). 

  • Battery Type:          Li-Ion (6 x 18650 cell)
  • Nominal Voltage:   3,7 V
  • Capacity:                15 Ah (55.5 Wh)

A trick to charge: switch your scope on, plug the charger, then switch your scope off and leave it plugged and switched off for the night. After a night of imaging during the colder months, wait until the next morning to charge it.

You can absolutely use a power bank to charge your Unistellar telescope via the USB port. 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. The USB port is not meant for anything else but charging (it's not there to connect to your PC or to get any data).

*Charger specifications: a standard smartphone charger (USB-C) 5V 2.4A can be used, non-quick-charge (and without an adaptive range), however, we strongly recommend charging with the original one provided in your box.

To clarify the blinking process:

  • Blink 6 times: the battery charge is between 0% and 64%
  • Blink 5 times: the battery charge is between 64% and 72%
  • Blink 4 times: the battery charge is between 72% and 80%
  • Blink 3 times: the battery charge is between 80% and 88%
  • Blink 2 times: the battery charge is between 88% and 96%
  • Blink 1 time: the battery charge is between 96% and 100%

General disclaimer: Do not leave batteries unused for extended periods of time, either in the product or in storage. The typical estimated life of a Lithium-Ion battery is about two to three years or 300 to 500 charge cycles, whichever occurs first. 

One charge cycle is a period of use from fully charged, to fully discharged, and fully recharged again. Rechargeable Lithium-Ion batteries have a limited life and will gradually lose their capacity to hold a charge. This loss of capacity (aging) is irreversible. As the battery loses capacity, the length of time it will power the product (run time) decreases. Lithium-Ion batteries continue to slowly discharge (self-discharge) when not in use or while in storage. Routinely check the battery’s charge status. 

The battery is not meant to be removed by the user without our permission. If you are experiencing any battery issues please contact our support team

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