Microsoft ACPI Control Method Battery Driver (CmBatt) Service Defaults in Windows 8

Control Method Battery Driver by Microsoft Corporation.

Default Settings

Startup type: Manual
Display name:Microsoft ACPI Control Method Battery Driver
Service name:CmBatt
Service type:kernel
Error control:normal
Path:%SystemRoot%\System32\drivers\CmBatt.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\CmBatt

Default Behavior

The Microsoft ACPI Control Method Battery Driver service is a kernel device driver. In Windows 8 it will not be started until the user starts it. If Microsoft ACPI Control Method Battery Driver fails to start, the error details are added to Windows 8 error log. When the operating system startup is complete, the user is being notified that the CmBatt service hasn't been started.

Restore Default Startup Configuration of Microsoft ACPI Control Method Battery Driver

1. Run the Command Prompt as an administrator.

2. Copy the command below, paste it into the command window and press ENTER:

sc config CmBatt start= demand

3. Close the command window and restart the computer.

The CmBatt service is using the CmBatt.sys file that is located in the C:\Windows\System32\drivers directory. If the file is removed or corrupted, read this article to restore its original version from Windows 8 installation media.