I have a problem with my lenovo laptop. Last night, I charged it and it works fine. but today, I charge my laptop once again because the battery goes low again but this time, when I plugged in the charger, the battery icon on the laptop seems not changing into charging icon, and when I put my cursor on the icon, it still says 18% remaining, 20 mins. it is literally not charging, but the charger seems fine. I really need help because I really have to use the laptop it is very important.