C# Signature:

[DllImport("coredll.dll")]
static extern bool GetSystemPowerStatusEx(out SYSTEM_POWER_STATUS_EX pStatus,
   bool fUpdate);

VB .NET Signature:

Declare Function GetSystemPowerStatusEx Lib "coredll.dll" _
   (<Out()> ByRef pStatus As SYSTEM_POWER_STATUS_EX, _
   ByVal fUpdate As Boolean) As Boolean

User-Defined Types:

SYSTEM_POWER_STATUS_EX

Notes:

If fUpdate is true, the values will be read directly from the low level driver. If false, they may be cached values and may be several seconds old.

Tips & Tricks:

Please add some!

Sample Code:

    public static byte GetBatteryLeftPercentage()
    {
        SYSTEM_POWER_STATUS_EX powerStatus;
        GetSystemPowerStatusEx(powerStatus, true);
        return powerStatus.BackupBatteryLifePercent;
    }

Alternative Managed API:

TODO

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