Battery protection mode

https://github.com/frederik-h/acer-wmi-battery

sudo apt install build-essential linux-headers-$(uname -r) git
git clone https://github.com/frederik-h/acer-wmi-battery.git
cd acer-wmi-battery
make
sudo insmod acer-wmi-battery.ko
echo 1 | sudo tee /sys/bus/wmi/drivers/acer-wmi-battery/health_mode