XPS 7590 battery draining super fast

HI I just bought this laptop a month ago or so, and the battery was working great but now all of a sudden it's draining extremely fast. Right now, I've had it charging all night, unplugged the cord (so it's at full power) and less than five minutes the indicator shows 2hrs 54minutes left, at 93%. 

I only have chrome and firefox open and have the battery set to dell power saving or whatever.