What is Vespera's autonomy time?
The autonomy of Vespera varies according to the observation conditions.
Under normal conditions of use (new product, charged battery, average humidity, continuous observation) & an ambient temperature of 20°C:
The autonomy was measured at 8 hours.
In case of activation of the dew heating system:
Autonomy was measured at 6 hours.
If you ask your instrument many changes of objects or autofocus, it will also consume the battery faster.
You can certainly plug an external battery to complete your night.