Pc super slow after battery fully drained

I own an alienware area 51m r1

normally I play battlefield V and my pc can run it at 144fps when the battery is at 100% and is charching.
Recently my battery fully drained now that the battery is at 100% and charching and it can only run it at max at 10 fps

could anyone help me pls
 
Try some benchmark software (like Cinebench and 3DMark) to see if problem is CPU, GPU, neither or both.
 
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