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XPS 13 7390 won't charge to 100%

I just got my laptop this morning (12hrs ago) and I noticed just now that after plugging it in for 6 hours now, it says 99% charged, 3 mins to full charge. Left it to go make a work call and came back to it says 6mins left to full charge. I shut down the laptop, went to go eat dinner and came  back, restarted it and now it says 99% charged, 13 mins to full charge. 

What in the world is happening??? I was really looking forward to this laptop but the first day and it's already concerning me. 

P.s. I haven't changed anything in battery management or done anything other than install Ms office and Google chrome on the laptop. 

Thanks everyone!

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