Battery Charging limiter Linux (ASUS Laptops)

When the laptop is being constantly used with a charger plugged in it is better to limit the charging at 60% to 80% to improve the battery health. Many laptop vendors like Asus provide software utility to set the battery max charge threshold but it works only in windows.

With Linux kernel 5.4 added the ability to set a battery charge threshold for many Asus laptops this script uses it to set the limit.

Usage

Run the script limit.sh with max battery threshold as an argument

eg: ./limit.sh 60

prompt to enter the password since it needs sudo permission

Will set the battery threshold to 60% so even if the laptop is plugged in it won't charge beyond 60% helps to protect the battery health.

Note: limit.sh set limit won't persist on system reboot

or

For operating systems with systemd use other script limitd.sh that will create a systemd service to apply the limit on system reboot.

eg: ./limitd.sh 60

limitd.sh set limit will persist on system reboot

Or if you use Runit instead of systemd, use limit_runit.sh

eg: ./limit_runit.sh 60

Reboot the system and check if limit works

Renable full capacity

Run the limit.sh script with 100%

./limit.sh 100

or

./limitd.sh 100

This will persist the change on reboot if systemd is available

Or use 'limit_runit.sh' for Runit.

./limit_runit.sh 100

Note: make the scripts executable before running by executing eg: chmod +x limit.sh

More info

• ASUS Battery Information Center
• Arch Wiki

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Tested with :

• Asus vivobook 15 with AMD Ryzen 3500U running Linux mint 20 Kernal 5.8.0-25-generic;
• Asus Vivobook 15 PRO OLED Ryzen5900 M3500 using 5.3.1 artix-linux;
• Asus TUF Gaming F15 using Debian 12;