diff --git a/flake.nix b/flake.nix
index 7b402d0..e1074b0 100644
--- a/flake.nix
+++ b/flake.nix
@@ -75,7 +75,7 @@
                 CPU_MIN_PERF_ON_AC = 0;
                 CPU_MAX_PERF_ON_AC = 100;
                 CPU_MIN_PERF_ON_BAT = 0;
-                CPU_MAX_PERF_ON_BAT = 80;
+                CPU_MAX_PERF_ON_BAT = 50;
               };
             };
           })
diff --git a/nixos/programs/system-packages.nix b/nixos/programs/system-packages.nix
index 856c096..8799754 100644
--- a/nixos/programs/system-packages.nix
+++ b/nixos/programs/system-packages.nix
@@ -16,5 +16,6 @@
     cmake
     man-pages
     man-pages-posix
+    brightnessctl
   ];
 }