Quick-n-Dirty MCVE to test getting battery status for Windows computers using Kernel32's GetSystemPowerStatus

BatteryMCVE.cpp

#include <iostream>
#include <Windows.h>

int main() {
    SYSTEM_POWER_STATUS sps;

    if (!GetSystemPowerStatus(&sps)) return 1;

    std::cout << "== BATTERY STATUS ==" << std::endl;
    std::cout << "Battery Present    : " << (sps.BatteryFlag < 100) << std::endl;
    std::cout << "AC Line Status     : " << ((int) sps.ACLineStatus) << std::endl;
    std::cout << "Battery Flag       : " << ((int) sps.BatteryFlag) << std::endl;
    std::cout << "Battery Charge     : " << ((int) sps.BatteryLifePercent) << "%" << std::endl;
    std::cout << "Battery Life Time  : " << ((int) sps.BatteryLifeTime) << " sec" << std::endl;
    std::cout << "Battery Full Time  : " << ((int) sps.BatteryFullLifeTime) << " sec" << std::endl;

    return 0;
}

BatteryMCVE.cs

using System.Runtime.InteropServices;

public class Power {
    [DllImport("kernel32.dll", SetLastError = true)]
    private static extern bool GetSystemPowerStatus(out SystemPowerStatus sps);

    public enum ACLineStatus : byte {
        Offline = 0,
        Online = 1,
        Unknown = 255
    }

    public enum BatteryFlag : byte {
        High = 1,
        Low = 2,
        Critical = 4,
        Charging = 8,
        NoSystemBattery = 128,
        Unknown = 255
    }

    [StructLayout(LayoutKind.Sequential)]
    public struct SystemPowerStatus {
        public readonly ACLineStatus LineStatus;
        public readonly BatteryFlag flgBattery;
        public readonly byte BatteryLifePercent;
        public readonly byte Reserved1;
        public readonly int BatteryLifeTime;
        public readonly int BatteryFullLifeTime;
    }

    public static SystemPowerStatus GetPowerStatus() {
        GetSystemPowerStatus(out var status);

        return status;
    }
}

public class BatteryMCVE {
    public static void Main(string[] args) {
        var sps = Power.GetPowerStatus();
        
        Console.WriteLine("== BATTERY REPORT ==");
        Console.WriteLine($"Battery Present    : {(int) sps.flgBattery < 100}");
        Console.WriteLine($"AC Line Status     : {Enum.GetName(sps.LineStatus)}");
        Console.WriteLine($"Battery Flag       : {Enum.GetName(sps.flgBattery)}");
        Console.WriteLine($"Battery Charge     : {sps.BatteryLifePercent}%");
        Console.WriteLine($"Battery Life       : {sps.BatteryLifeTime} sec");
        Console.WriteLine($"Battery Full Life  : {sps.BatteryFullLifeTime} sec");
    }
}