{
  lib,
  config,
  pkgs,
  ...
}: let
  inherit (lib) mkIf;
in {
  config = mkIf config.battery {
    # power monterting
    services.upower = {
      enable = !config.minimal;
      percentageLow = 20;
      percentageCritical = 10;
      percentageAction = 4;
      criticalPowerAction = "Hibernate";
    };

    # power profiles
    services.tlp = {
      enable = !config.minimal;
      settings = {
        CPU_SCALING_GOVERNOR_ON_AC = "performance";
        CPU_SCALING_GOVERNOR_ON_BAT = "powersave";

        CPU_ENERGY_PERF_POLICY_ON_BAT = "power";
        CPU_ENERGY_PERF_POLICY_ON_AC = "performance";

        CPU_MIN_PERF_ON_AC = 0;
        CPU_MAX_PERF_ON_AC = 100;
        CPU_MIN_PERF_ON_BAT = 0;
        CPU_MAX_PERF_ON_BAT = 20;
      };
    };

    # packages
    environment.systemPackages = with pkgs; [
      acpi
    ];
  };
}