diff --git a/check-battery.sh b/check-battery.sh
new file mode 100755
index 0000000..f0e36f7
--- /dev/null
+++ b/check-battery.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# low battery warning
+#
+
+BATTERY=/sys/class/power_supply/BAT0
+
+REM=`grep "POWER_SUPPLY_CHARGE_NOW" $BATTERY/uevent | awk -F= '{ print $2 }'`
+FULL=`grep "POWER_SUPPLY_CHARGE_FULL_DESIGN" $BATTERY/uevent | awk -F= '{ print $2 }'`
+PERCENT=`echo $(( $REM * 100 / $FULL ))`
+
+if [ $PERCENT -le "33" ]; then
+  #/usr/bin/i3-nagbar -m "Low battery"
+  #echo 'low battery '$PERCENT
+  notify-send --urgency=critical "Low battery $PERCENT%"
+fi
+
diff --git a/dim b/dim
index e1eb40e..4317bfc 100755
--- a/dim
+++ b/dim
@@ -1,3 +1,5 @@
 #!/bin/bash
-sudo tee /sys/class/backlight/acpi_video0/brightness <<< $1
+driver="intel_backlight"
+#acpi_video0 or intel_backlight
+sudo tee /sys/class/backlight/$driver/brightness <<< $1