100% battery drain after update to Bios 1.15.0

Did anyone have this problem:  I installed Bios 1.15.0 last week.  My laptop was fully charge.  I work for an hour or two (plug in AC) and then turned off my laptop and unplug it. 

Today, I plug it in and turn it on, and found that the battery was completely drained.  I look in the windows event viewer to verify that the pc did not start by itself but nothing happened between the time I turned it off and the time I turned it on. 

In the bios, it says the battery is in excellent condition.

I never had any problem with the previous bios.  I wanted to downgrade the bios, unfortunately, Dell prevent it. 

I am charging it again to 100% and let it rest for another week to see if the problem occurs again.