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)
2 Answers
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.
As far as I am aware, there is no way to poll bluetooth device data beyond what you would get with Get-WmiObject, since the battery status seen in Windows Settings -> Bluetooth Devices is something coming from the vendors/devices driver and seems to, as of now, be inaccessible by PowerShell, unless there is some exotic snapin I am not aware of.
You can get all possible device information via this command:
Get-WmiObject -Query "select * from win32_PnPEntity" | Where Name -like "MyDeviceName"
Or if you are unsure how the device is named as of now, this would return a complete list of "devices":
Get-WmiObject -Query "select * from win32_PnPEntity" | Select Name
Additionally, I couldn't find battery information in the registry - maybe someone more knowledge can expand on that because the registry probably contains the necessary information as it must be stored somewhere on the device.
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