Lenovo Vantage is described as 'Vantage is a free app that makes it easy to optimize your computer performance and enable your device security protection. With Vantage, you can:' and is a Driver Updater in the system & hardware category. There are five alternatives to Lenovo Vantage for a variety of platforms, including Windows, Linux, Arch Linux, Gentoo and Fedora apps. The best Lenovo Vantage alternative is Lenovo Legion Toolkit (LLT), which is both free and Open Source. Other great apps like Lenovo Vantage are PlasmaVantage, Lenovo Legion Linux (LLL), LenovoController and Asus Battery Health Charging.
Lenovo Legion Toolkit (LLT) is a utility created for Lenovo Legion (and similar) series laptops, that allows changing a couple of features that are only available in Lenovo Vantage or Legion Zone.
This plasmoid allows you to easily control features of your Lenovo Legion or Ideapad laptop series such as battery fast charging, conservation mode, hybrid graphics and more that are exposed by the LenovoLegionLinux and Ideapad kernel modules.
Lenovo Legion Linux (LLL) brings additional drivers and tools for Lenovo Legion series laptops to Linux. It is the alternative to Lenovo Vantage or Legion Zone (both Windows only).
This software allows Asus laptop users to prevent their battery from charging above a defined thershold, eg 60%, 80% or 100%, while still being plugged, protecting the battery from overcharging and improving battery life.
I tried and it does what is needed, keep the battery charged up to 60% and allows you to select fast charge or normal. Works great!