XPS 13 (9350) battery problem (blinking amber light).

Hello,

My XPS 13 started to act out pretty strange today. It seems like it doesn't not use battery at all, thus I can only boot it up when it's plugged to the charger. The battery indicator shows that it's NOT charging the battery, and it's stuck at 48%. When I disconnect it from the charger while it's running, it turns off immediately, and the only way to boot it up is to plug it back again. Additionally, the light indicator below the touchpad is blinking rapidly (~3-4 blinks per second) with amber light, both when I'm in OS as well as already on Dell splash screen during boot.

Any ideas on what might be going on ? I have bios 1.3.3 which I updated around April.