batteryobserver.sh: different sleeping time depending on battery level

scripts/.config/scripts/batteryobserver.sh

@@ -28,6 +28,12 @@ while true; do
             fi
             ;;
     esac
-    sleep 2m
+    if [ $level -gt 50 ]; then
+        sleep 40m
+    elif [ $level -gt 30 ]; then
+        sleep 10m
+    else
+        sleep 2m
+    fi
 done