Acer predator Helios 300 charging issue

I have been experiencing the charging issue while my system is plugged in and once the charge hits 100% the charging stops and again starts when it goes down to 99%. This is happening from last month. I mainly use it for gaming and most of the time its plugged in, so now due to this issue, the fps drop so low for every 10 seconds, which is too bothering. I know getting help from Acer support is an ideal option but as the pandemic scene is getting worse, I am kinda restricted. I have seen multiple threads regarding this issue but none of them helped me to get a solution.

Things I have tried:

1. Tried uninstalling drivers.

2. Did battery reset.

3. battery calibration also done.

4. Tried different power outlets.

Any help would be highly appreciated.

Ps.also if anyone suggests me to replace the battery, can provide details from where I can get one so that i can do it myself. (I live in India)

My system is 2 + years old, and have run out of warranty.

System: Acer predator G3-572.