This may happen due to any of the following reasons:
Given the situation where the length of the track/rod is 1.5m, the weight of the curtain is 12kg, and the device is sheduled to open and close the curtain once a day, the curtain driver can run for around 9 - 10 month.
PS: the battery life can be influnced by the friction between the curtain and the track.
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