Shuts down when not plugged in, but runs fine when connected to the charge (It's not the battery)

[Mai Thiên Kim Nguyễn]

I'm experiencing a very annoying issue with my laptop. Lately, it frequently shuts down when not plugged in, but runs fine when connected to the charger. I've looked into possible causes like the battery, battery settings, and the adapter, but they seem to be fine. I recall that there was a time when I installed some files to optimize my laptop, and unintentionally installed something that made changes to the system settings, leading to the problem I mentioned. Please help me with this =((

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