Triggering tasks and running programs when Windows 7 is plugged in or unplugged? [duplicate]

By default, Windows does not log an event when you unplug or plug in your computer.

However, with PowerShell you can listen for such a change and write your own events to the log. This script will do that:

New-EventLog -Source BatteryStatusMonitor -LogName Application

Function OnBatteryStatusChange ($NewStatus) {
  If ($NewStatus -eq 1) {
    $EventID = 5001
    $Message = "The computer was unplugged."
  } ElseIf ($NewStatus -eq 2) {
    $EventID = 5002
    $Message = "The computer was plugged in."
  } Else {
    $EventID = 5000
    $Message = "Battery status changed to $NewStatus"
  }
  Write-EventLog -LogName Application -Source BatteryStatusMonitor -EventID $EventID -Message $Message
}

$Query = "select * from __instancemodificationevent within 3 where targetinstance isa 'win32_battery' and targetinstance.batterystatus <> previousinstance.batterystatus"

Register-WmiEvent -Query $Query -Action {OnBatteryStatusChange $Event.SourceEventArgs.NewEvent.TargetInstance.BatteryStatus} -SourceIdentifier "BatteryStatusChange"

For (;;) {}