Day Screen High

I ve got an HP laptop at 4 weeks. Since 2 days the brightness of the screen began to change on its own?
I use HP as an optimized power plan but now and then it changes to high performance on their own. This happens when running on battery. What is the problem? Thank you in advance for your help.
It could be batterie go up and down? Or it could just be ajusting, they do it. its annoying (N) Or, you can press a button?
Zong – SUB KEH DO day – High Quality – Wide Screen
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