Change Low Battery Sound Threshold in Regedit

This article explains how to modify the Windows Registry to adjust the battery percentage threshold that triggers system-wide low battery warning notifications and sounds. By navigating to the power settings keys within Registry Editor, you can define custom percentage triggers for when your system alerts you to plug in your device.

Step 1: Identify the Active Power Scheme

  1. Press Win + R, type regedit, and press Enter to open the Registry Editor.

  2. Navigate to the following path:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\User\PowerSchemes

  3. In the right pane, locate the string value named ActivePowerScheme. Note down the alphanumeric GUID displayed in its Data field (for example, the default Balanced scheme GUID is 381b4222-f694-41f0-9685-ff5bb260df2e).

Step 2: Navigate to the Low Battery Level Subkey

  1. In the left navigation pane of Registry Editor, expand the folder corresponding to your ActivePowerScheme GUID.

  2. Expand the battery subgroup folder:

    e73a048d-bf27-4f13-9732-d6060e836dc1

  3. Select the subkey for the Low Battery Level:

    81830ffd-4d35-4834-8703-4e088770b070

The full active path will look like:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\User\PowerSchemes\[ActivePowerSchemeGUID]\e73a048d-bf27-4f13-9732-d6060e836dc1\81830ffd-4d35-4834-8703-4e088770b070

Step 3: Change the Threshold Percentage

  1. In the right pane of the 81830ffd-4d35-4834-8703-4e088770b070 key, find the following DWORD (32-bit) values:
    • DCSettingIndex: Controls the threshold percentage when running on battery power.
    • ACSettingIndex: Controls the threshold percentage when plugged into AC power.
  2. Double-click DCSettingIndex.
  3. Under Base, select Decimal.
  4. In the Value data field, enter your desired battery percentage threshold (e.g., enter 15 for a 15% threshold).
  5. Click OK.
  6. (Optional) Repeat the process for ACSettingIndex if you want to set a custom threshold when plugged in.

Step 4: Ensure the Low Battery Notification Sound Is Active

  1. Navigate back to the battery subgroup folder:

    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\User\PowerSchemes\[ActivePowerSchemeGUID]\e73a048d-bf27-4f13-9732-d6060e836dc1

  2. Select the Low Battery Notification subkey:

    bcded951-187b-4d05-bccc-f7e51960c258

  3. Ensure DCSettingIndex is set to 1 (enabled) so the notification and its associated sound trigger when the defined threshold is reached.

Step 5: Apply the Changes

  1. Close the Registry Editor.
  2. Restart your computer or open Command Prompt as Administrator and run powercfg /setactive [ActivePowerSchemeGUID] to immediately apply the updated power configuration.