How to get Bluetooth device battery percentage using PowerShell on windows?

Question

I am trying to plot a graph for Bluetooth headphone battery discharge. For that I need to read battery percentage of the connected device. I can see power information is available on GUI for the device. Is there any way to get the battery percentage info for connected Bluetooth device using PowerShell? (like using wmi or anything else)

Answer 1

In my findings, you can get information on Bluetooth devices using the Get-PnpDevice cmdlet. This should return a list of PnP Devices, their Status, Class, FriendlyName and InstanceID.

Get-PnpDevice

You can filter the results with -Class parameter. To specify Bluetooth PnP devices, you can enter "Bluetooth" as a string value for the -Class parameter.

Get-PnpDevice -Class 'Bluetooth'

You can then specify the device you have in mind from this list by their FriendlyName using the -FriendlyName parameter and enter the desired device's FriendlyName as a string value for the parameter.

Get-PnpDevice -Class 'Bluetooth' -FriendlyName 'Device FriendlyName'

Note: You can also specify the device using the -InstanceId parameter and providing the device's InstanceId as a string value for the parameter.

If you then pipe the previous command to the Get-PnpDeviceProperty cmdlet, it will return a list of the device's properties, including its InstanceId, KeyName, Type and Data.

Get-PnpDevice -Class 'Bluetooth' -FriendlyName 'Device FriendlyName' |
    Get-PnpDeviceProperty

Beyond this point, I was able to further filter the results of the command by using the -KeyName parameter and entering the KeyName of the property that (I assume) contains Device Power Data as a string value for the parameter.

Get-PnpDevice -Class 'Bluetooth' -FriendlyName 'Device FriendlyName' |
    Get-PnpDeviceProperty -KeyName 'PropertyKeyName'

Unfortunately this is as far as I've gotten to solving the problem. Hopefully my contribution helps.

Answer 2

Paulo Amaral's comment above is indeed the answer.

The code below will provide you with a command you can reuse to query the battery state of your device:

Get-PnpDevice -FriendlyName "*<Device Name>*" | ForEach-Object {
    $local:test = $_ |
    Get-PnpDeviceProperty -KeyName '{104EA319-6EE2-4701-BD47-8DDBF425BBE5} 2' |
        Where Type -ne Empty;
    if ($test) {
        "To query battery for $($_.FriendlyName), run the following:"
        "    Get-PnpDeviceProperty -InstanceId '$($test.InstanceId)' -KeyName '{104EA319-6EE2-4701-BD47-8DDBF425BBE5} 2' | % Data"
        ""
        "The result will look like this:";
        Get-PnpDeviceProperty -InstanceId $($test.InstanceId) -KeyName '{104EA319-6EE2-4701-BD47-8DDBF425BBE5} 2' | % Data
    }
}

For my <Headset> device, the output looked similar to:

To query battery for <Headset>, run the following:
Get-PnpDeviceProperty -InstanceId 'BTHENUM\{0000####-0000-####-####-############}_VID&########_PID&####\#&########&#&############_#########' -KeyName '{104EA319-6EE2-4701-BD47-8DDBF425BBE5} 2'

The result will look like this:
90