adb shell settings put global stay_on_while_plugged_in 3

for BATTERY_LEVEL in {1..100}
do
    adb shell dumpsys battery set level $BATTERY_LEVEL
    adb shell settings put system screen_brightness 200
    adb exec-out screencap -p > screen$BATTERY_LEVEL.png
done      

adb shell dumpsys battery reset   
adb shell settings put global stay_on_while_plugged_in 0