Maybe your battery aging, battery's life is about a year (I also use laptop)
If you often use external power supply, take out the battery, it will extend battery life, because the battery's life depends on the times of charging and discharging.
You say the screen is brighter, some laptops have a default value of setting LCD screen in computer system, you can adjust the brightness youself. Press "EN" key, and press "upward" at the same time, the screen can be brighter.
Or you can get a
replacement battery,
I don't know what's the brand of your laptop, I have bought a
battery online, the quality is OK.
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