Looking for roll down at 11 am IF light sensor reads more than x Lux for example.
I have hue motion sensor with temp and brightness sensor.
read somewhere that Ikea estimates batterylife around one year with one cycle a day.
i bought mine in September last year but have not used them much. Wintertime in Sweden does not comfort you with sunrays.
As for battery, it should be possible to replace it wire but it would require soldering and the correct power supply. Tearing appart the battery itself and use chassi and contacts would be my approach.