I have a battery question

sydneyblue203

Estimable
Aug 2, 2014
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I have a gaming laptop Asus ROG G751JL-DS71 965m
I was gaming on it and after I return to the desktop I noticed the power was down to 16%. My first idea was it was unplugged somehow but that cant be because I didn't notice a performance drop. I unplugged it than plugged it back in and it went back to normal should I be concerned?
 

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