Test battery status using PowerShell - powershell

Question

I'm trying to use PowerShell to tell me when my computer is on battery or AC Power.
I want my script to send me a windows notification when my laptop's charger unplugs.
For the moment, I try to use a recursive fonction to test my battery status every 5 seconds but it doesn't work...
Please, be indulgent about my level, I didn't know anything about PowerShell 3 hours ago... And the last time I coded something was a long time ago !
Function Test-IsOnBattery
{
$battery = Get-WmiObject Win32_Battery
If ($battery.BatteryStatus -eq 2) {
Write-Host "PC sur secteur."
Start-Sleep -Seconds 5
return Test-IsOnBattery
}
Else {
Write-Host "PC sur batterie."
New-BurntToastNotification -Text "Battery Notification" , "Batterie plus sur secteur !"
}
}

Answer 1

Nathan,
Here's a script you can use that you can run from a Scheduled Task, rather than a loop, and have it start on boot up and repeat every so many minutes.
<#+---------------------------------------------------------------------------+
| PowerShell Pgm: BatteryStatus.ps1 |
| Programmed By : The Computer Mentor |
| aka : RetiredGeek # askWoody.com & StackOverFlow.com |
| Created : 06 Mar 2013 |
| Last Updated : 23 Jan 2023 | |
| Current Ver. : 6.0 |
+---------------------------------------------------------------------------+
#>
Clear-Host
Add-Type -AssemblyName "System.Windows.Forms"
$StatusMsg = {
[Windows.Forms.MessageBox]::Show($Message, $Title,
[Windows.Forms.MessageBoxButtons]::OK ,
[Windows.Forms.MessageBoxIcon]::Information)}
$Message = ""
$Title = "Battery Status:"
<#+-----------------------------------------------------+
| BatterStatus Values |
|Other (1) The battery is discharging. |
|Unknown (2) The system has access to AC so no |
| battery is being discharged. However, |
| the battery is not necessarily charging.|
|Fully Charged (3) |
|Low (4) |
|Critical (5) |
|Charging (6) |
|Charging and High (7) |
|Charging and Low (8) |
|Charging and Critical (9) |
|Undefined (10) |
|Partially Charged (11) |
+-----------------------------------------------------|#>
$GWArgs = #{ Class = "Win32_Battery"
ComputerName = "LocalHost"
}
$MyBattery = Get-CIMInstance #GWArgs
If ($Null -eq $MyBattery) {
$Message = "No Battery Present"
}
Else {
$BatteryRemaining = [Int]$MyBattery.EstimatedChargeRemaining
if(($BatteryRemaining -lt 30) -and
$($MyBattery.BatteryStatus) -eq 1) {
$Message = "Battery Low...Please Charge Me!"
}
Elseif(($BatteryRemaining -gt 90) -and
$($MyBattery.BatteryStatus) -ne 1) {
$Message =
"Battery CHARGED above 90%...Please Unplug Me!"
}
} #End Else
if($Message -ne "") {
$Null = & $StatusMsg
}
<#
+----------------------------------------------------------+
| Notes: |
| 1. To call as a scheduled task do the following in the |
| Action Pane |
| A. Action: Start a Program |
| B. Program/script: powershell.exe |
| D. Set the Trigger run At Logon and then repeat |
| every few minutes. |
+----------------------------------------------------------+
#>
If you want to use Toast msgs. just replace that logic where I have my $StatusMgs lines.