diff --git a/modules/devices/files/tlp.conf b/modules/devices/files/tlp.conf
index 028fb9f..05be7ab 100644
--- a/modules/devices/files/tlp.conf
+++ b/modules/devices/files/tlp.conf
@@ -3,7 +3,7 @@ TLP_ENABLE=1
 
 # Operation mode when no power supply can be detected: AC, BAT.
 # Concerns some desktop and embedded hardware only.
-TLP_DEFAULT_MODE=AC
+TLP_DEFAULT_MODE=BAT
 
 # Operation mode select: 0=depend on power source, 1=always use TLP_DEFAULT_MODE
 # Hint: use in conjunction with TLP_DEFAULT_MODE=BAT for BAT settings on AC.