DELL XPS 13 2017 model battery draining while laptop ASLEEP

My DELL XPS 13 2017 model battery getting drained for no reason while laptop is asleep. I have XPS 13 2017 model i7 16GB 512SSD.

Any solution to this problem?

I have updated all the drivers, firmwares, removed all wake up PC power options, and there's no wake up timer, this is depressing, and gravely disappointing. 

I thought this laptop can last 7 hours with standard usage, but even sleep mode wouldn't last me 7 hours -_-