DELL Inspiron 15 3521 Battery Recognised But Not Charging!

Hi, my laptop battery is okay! Windows 8 recognises the battery and indicates charging. But in actuality, the battery is not charging. As you use it even while plugged to power, it gets drained until 5% and alerts you of low battery.

However, I updated the windows 8.0 to windows 8.1. Thereafter, I began to notice this malfunctioning.

I do not know what could cause this.