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:

Returns true if the function succeeds.

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;

      if (GetSystemPowerStatusEx(powerStatus, true))
     return powerStatus.BackupBatteryLifePercent;
      else
     return 100; // assume full power if failed
   }

Alternative Managed API:

TODO