Battery Monitor

battery-monitor.ps1

$dischargeHistory = @()
$previousChargingState = $null

while ($true) {
    $battery = Get-WmiObject Win32_Battery
    if ($battery) {
        $batteryLevel = $battery.EstimatedChargeRemaining
        
        # Get current discharge rate
        $dischargerate = Get-WmiObject -Class "BatteryStatus" -Namespace "root\wmi"
        $rate = [math]::Abs($dischargerate.DischargeRate)
        $rateInMw = ($rate/1000)
        
        # Check if charging state changed
        $currentChargingState = $dischargerate.DischargeRate -gt 0
        if ($previousChargingState -ne $null -and $previousChargingState -ne $currentChargingState) {
            $dischargeHistory = @()  # Reset history when state changes
        }
        $previousChargingState = $currentChargingState
        
        $dischargeHistory += $rateInMw
        
        # Calculate average
        $averageRate = ($dischargeHistory | Measure-Object -Average).Average

        # Calculate remaining time based on average discharge rate
        $designCapacity = (Get-WmiObject -Class "BatteryFullChargedCapacity" -Namespace "root\wmi").FullChargedCapacity
        $currentCapacity = ($designCapacity * $batteryLevel) / 100
        
        if ($averageRate -gt 0) {
            $remainingMinutes = ($currentCapacity / ($averageRate * 1000)) * 60
            $hours = [math]::Floor($remainingMinutes / 60)
            $minutes = [math]::Floor($remainingMinutes % 60)
            $timeEstimate = "$hours hours $minutes minutes"
        } else {
            $timeEstimate = "Calculating..."
        }
        
        Clear-Host
        Write-Host "Battery Level: $batteryLevel%"
        Write-Host "Current Discharge Rate: $($rateInMw.ToString("F1"))mW"
        Write-Host "Average Discharge Rate: $($averageRate.ToString("F1"))mW"
        
        if ($dischargerate.DischargeRate -gt 0) {
            Write-Host "Estimated Time: $timeEstimate"
        } else {
            Write-Host "Estimated Time: Charging"
        }
    }
    else {
        Write-Host "No battery detected"
    }
    
    Start-Sleep -Seconds 5
}