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The kernel-mode battery class driver, battc.sys, provides device-independent battery support and exports support routines for use by all device-specific battery miniclass drivers.
The battery class driver takes care of the following tasks for miniclass drivers:
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Performing a large part of miniclass driver initialization, including allocating system resources and space for the miniclass driver's class data
Handling device control IRPs (IRP_MJ_DEVICE_CONTROL) that specify battery class IOCTLs. (See the Microsoft Windows SDK for information about these IOCTLs.)
Serializing requests to the battery device
Administering DC power policy for the operating system
Freeing system resources if the miniclass driver is unloaded
Handling certain standard battery WMI classes
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See Battery Miniclass Driver Routines for descriptions of the routines that the battery class driver exports to battery miniclass drivers.