Retrieve the computer's charging status & current battery level

Question

I needed a VBA procedure to retrieve the system's current battery charge level and charging status.

I was surprised not to find anything on Stack Overflow, and I eventually figured it out, so I'll share the code here as a Q+A.

Answer 1

Private Declare PtrSafe Function GetSystemPowerStatus Lib "kernel32" (lpSystemPowerStatus As SYSTEM_POWER_STATUS) As LongPtr

Private Type SYSTEM_POWER_STATUS
    ACLineStatus As Byte
    BatteryFlag As Byte
    BatteryLifePercent As Byte
    SystemStatusFlag As Byte
    BatteryLifeTime As Long
    BatteryFullLifeTime As Long
End Type


Public Sub getBatteryStatus() 'batt info to immediate window
    
    Dim SPS As SYSTEM_POWER_STATUS
    GetSystemPowerStatus SPS 'get system batt power status
    
    With SPS
        Debug.Print "Battery Life:  ", ;
        Select Case .BatteryLifePercent
            Case 255:   Debug.Print "Unknown"
            Case Else:  Debug.Print .BatteryLifePercent & "%"
        End Select
        
        Debug.Print "Battery Life Time: ", ;
        Select Case .BatteryLifeTime
            Case -1:    Debug.Print "Charging"
            Case Else
                Debug.Print Int(.BatteryLifeTime / 60) & "min / ";
                Select Case .BatteryFullLifeTime
                    Case -1
                        If .BatteryLifePercent = 0 Then
                            Debug.Print "Unknown"
                        Else 'estimate FullLifeTime:
                            Debug.Print "~" & Int(.BatteryLifeTime / .BatteryLifePercent * 5 / 3) & "min"
                        End If
                    Case Else
                        Debug.Print .BatteryFullLifeTime & "sec"
                End Select
        End Select

        Debug.Print "AC power status: ", ;
        Select Case .ACLineStatus 'show some information
            Case 0:     Debug.Print "Offline"
            Case 1:     Debug.Print "OnLine"
            Case Else:  Debug.Print "Unknown"
        End Select
        
        Debug.Print "Battery charge status: ", ;
        Select Case .BatteryFlag
            Case 0:     Debug.Print "Not Charging (33-66%)"
            Case 1:     Debug.Print "High (>66%)"
            Case 2:     Debug.Print "Low (<33%)"
            Case 4:     Debug.Print "Critical (<5%)"
            Case 8:     Debug.Print "Charging"
            Case 1 + 8: Debug.Print "High (>66%)- Charging"
            Case 2 + 8: Debug.Print "Low (<33%) - Charging"
            Case 4 + 8: Debug.Print "Critical (<5%) - Charging"
            Case 128:   Debug.Print "No System Battery"
            Case 255:   Debug.Print "Unknown Status"
        End Select
    
        Debug.Print "Battery saver: ", ;
        Select Case .SystemStatusFlag
            Case 0:     Debug.Print "Off"
            Case 1:     Debug.Print "On (Save energy where possible)" 'Windows 10 only
        End Select

    End With
End Sub

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More Information:

• MSDN : GetSystemPowerStatus function (Windows)
• MSDN : SYSTEM_POWER_STATUS structure
• MSDN : Battery Saver