Microsoft Composite Battery Driver - Windows Vista Service
Composite Battery Driver by Microsoft Corporation.
This service also exists in Windows 7.
Startup Type
Since Microsoft Composite Battery Driver is a kernel mode driver, its startup might be configured depending on installed hardware. Changing its startup configuration might cause hardware issues. In the table below you can see how it is configured on my system, but your default settings might differ from mine.
| Windows Vista edition | without SP | SP1 | SP2 |
|---|---|---|---|
| Starter | Disabled | Disabled | Disabled |
| Home Basic | Disabled | Disabled | Disabled |
| Home Premium | Disabled | Disabled | Disabled |
| Business | Disabled | Disabled | Disabled |
| Ultimate | Disabled | Disabled | Disabled |
Default Properties
| Display name: | Microsoft Composite Battery Driver |
| Service name: | Compbatt |
| Type: | kernel |
| Path: | %WinDir%\system32\drivers\compbatt.sys |
| Error control: | critical |
| Group: | System Bus Extender |
Default Behavior
The Microsoft Composite Battery Driver service is a kernel mode driver. If Microsoft Composite Battery Driver fails to load or initialize, the error is logged and the computer attempts to restart with the LastKnownGood configuration. If the LastKnownGood configuration fails, Windows Vista startup also fails, and the boot process halts with a Stop error. If you disable this service, Windows Vista will fail to start. Do NOT change this service startup configuration if your computer is working.
Restore Default Startup Type of Microsoft Composite Battery Driver
Automated Restore
1. Select your Windows Vista edition and Service Pack, and then click on the Download button below.
2. Save the RestoreMicrosoftCompositeBatteryDriverWindowsVista.bat file to any folder on your hard drive.
3. Right-click the downloaded batch file and select Run as administrator.
4. Restart the computer to save changes.
Note. Make sure that the compbatt.sys file exists in the %WinDir%\system32\drivers folder. If this file is missing you can try to restore it from your Windows Vista installation media.