Laptop does not switch to battery

I have an Inspiron 7568. I recently had a water spill accident on the keyboard. The laptop immediately switched off. I then took out the back panel and removed the battery, hard disk, etc, and let the laptop air dry for a day. After that, the laptop turned on again and worked normally except for one issue. When I unplug the laptop, it no longer switches to battery power - it just turns off. I have already checked the battery health - it is excellent, charging and currently holds >75% charge. I have tried the usual solutions like taking the battery out and pressing the power button on for 30 seconds, etc.

Although the laptop works well with AC power, it is annoying because if the charging cable accidentally becomes loose, the laptop loses power. At this point, I don’t understand what the problem is. Any help is appreciated!