Laptop had 70% battery, plugged it in, has 30%

Any reason this could be a cause for alarm? It's a brand spanking new (refurbished) laptop that I got two days ago.

EDIT: Thanks everyone. I've run a few battery diagnostics and everything looks fine.

Submitted August 31, 2017 at 08:09PM by Jalaris http://ift.tt/2vJ0vmW