diff --git a/app/AppConfig.cs b/app/AppConfig.cs
index f85e65e5..eca94356 100644
--- a/app/AppConfig.cs
+++ b/app/AppConfig.cs
@@ -691,4 +691,9 @@ public static class AppConfig
         return ContainsModel("G834JYR") || Is("force_miniled");
     }
 
+    public static bool SaveDimming()
+    {
+        return Is("save_dimming");
+    }
+
 }
diff --git a/app/Display/VisualControl.cs b/app/Display/VisualControl.cs
index d1bb0f7f..158f22c4 100644
--- a/app/Display/VisualControl.cs
+++ b/app/Display/VisualControl.cs
@@ -323,14 +323,32 @@ namespace GHelper.Display
             SetGamma(_brightness);
         }
 
+        public static void InitBrightness()
+        {
+            if (!AppConfig.IsOLED()) return;
+            if (!AppConfig.SaveDimming()) return;
+
+            int brightness = GetBrightness();
+            if (brightness >= 0) SetBrightness(brightness);
+        }
+
+        private static bool IsOnBattery()
+        {
+            return AppConfig.SaveDimming() && SystemInformation.PowerStatus.PowerLineStatus != PowerLineStatus.Online;
+        }
+
+        public static int GetBrightness()
+        {
+            return AppConfig.Get(IsOnBattery() ? "brightness_battery" : "brightness", 100);
+        }
+
         public static int SetBrightness(int brightness = -1, int delta = 0)
         {
             if (!AppConfig.IsOLED()) return -1;
-
-            if (brightness < 0) brightness = AppConfig.Get("brightness", 100);
+            if (brightness < 0) GetBrightness();
 
             _brightness = Math.Max(0, Math.Min(100, brightness + delta));
-            AppConfig.Set("brightness", _brightness);
+            AppConfig.Set(IsOnBattery() ? "brightness_battery" : "brightness", _brightness);
 
             brightnessTimer.Start();
 
diff --git a/app/Program.cs b/app/Program.cs
index 247f683c..d03df92f 100644
--- a/app/Program.cs
+++ b/app/Program.cs
@@ -256,6 +256,8 @@ namespace GHelper
                 settingsForm.AutoKeyboard();
             }
 
+            VisualControl.InitBrightness();
+
             return true;
         }
 
diff --git a/app/Settings.cs b/app/Settings.cs
index ab6385ff..4a223711 100644
--- a/app/Settings.cs
+++ b/app/Settings.cs
@@ -453,7 +453,7 @@ namespace GHelper
             Invoke(delegate
             {
                 sliderGammaIgnore = true;
-                sliderGamma.Value = AppConfig.Get("brightness", 100);
+                sliderGamma.Value = VisualControl.GetBrightness();
                 labelGamma.Text = sliderGamma.Value + "%";
                 sliderGammaIgnore = false;
             });