Unusual performnace analysis while playing assassin creed odyssey on laptop

Jan 27, 2019
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Hello guyz.. I just ran into a problem. Plz be kind and help me.
Recently i just noticed that, while playing assassin creed odyssey on my laptops battery power, the fps graph is irregular with varying slope. But when connected to external power supply, it is just a straight line and works smooth.
What might be the possible cause? Is it that my battery is weak or something else.....
 

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