I’ve only had my motion sensors for 2 months and they have been set on high. I’m keeping an eye on the battery. I’ll report back on how long the battery lasts. These alarm motion sensors are on ALL of the time (even when disarmed). They generate hundreds of events per day which can’t be good for the battery life.
I would not recommend pointing the sensor out the window because you could generate a lot of false alarms. The sensors are IR-based so the sun or other reflections can cause you a lot of issues.
(And I couldn’t download your images - just got an error 
)