Battery

modulename: battery.ko

configname: CONFIG_ACPI_BATTERY

Linux Kernel Configuration
└─>Power management and ACPI options
└─>ACPI (Advanced Configuration and Power Interface) Support
└─>Battery
In linux kernel since version 3.10 (release Date: 2013-06-30)  
This driver adds support for battery information through
/proc/acpi/battery. If you have a mobile system with a battery,
say Y.

To compile this driver as a module, choose M here:
the module will be called battery.

source code:

depends
CONFIG_ACPI

is selected by
CONFIG_THINKPAD_ACPI