diff --git a/.xinitrc b/.xinitrc
index beda48e..4ff71dc 100644
--- a/.xinitrc
+++ b/.xinitrc
@@ -19,7 +19,13 @@ redshift                                                        &
 dunst                                                           &
 sbar                                                            &
 
-xset dpms 300 # lock 5m
 xss-lock -- lock &
+if ls -d /sys/class/power_supply/BAT*/ > /dev/null 2>&1; then
+    xset dpms 300 300 300 # Turn of the screen after 5 min
+    xset s    315         # Lock Screen after 15 secs later
+else
+    xset dpms 1800 1800 1800 # Turn of the screen after 30 min
+    xset s    1815           # Lock Screen 15 sec later
+fi
 
 exec dbus-launch dwm