This repository contains a Linux kernel driver for managing battery health features on Acer laptops via the WMI (Windows Management Interface) interface. The driver enables control of two key battery functions: a health mode that limits charge to 80% to prolong battery lifespan, and a calibration mode that performs a full charge-discharge cycle for accurate capacity reporting. It also provides battery temperature readings. Implemented as a single kernel module (acer-wmi-battery.c), it interacts with the laptop's firmware through WMI methods to query and set battery parameters, exposing these controls via sysfs attributes under /sys/bus/wmi/drivers/acer-wmi-battery/. The driver follows standard Linux kernel module practices, including proper error handling, version-dependent includes for compatibility, and sysfs attribute creation for user-space interaction. It includes reusable WMI helper functions that encapsulate the boilerplate for WMI method calls, buffer handling, and response validation. The project is actively maintained with recent commits, supports multiple Acer laptop models as documented in MODELS.md, and is licensed under GPL-2.0.