I am trying to figure out what is draining battery on my Early-2015 Retina MacBook Pro overnight. I close the lid and leave it in sleep state overnight. The next morning, quite often I find that almost 70-80% of the battery has drained. What is surprising is that on some mornings, I find that only 10-20% of the battery has drained.
I have the same model MacBook Pro at home too. Both have the same issue.
OS: macOS Mojave (10.14.2)
Battery cycle count (or work machine): 217 Battery condition: Normal.
I use an external mechanical keyboard while working, but unplug it before I leave. I do have a USB wireless mouse. The receiver for the mouse remains plugging in, but I turn off the power switch for the mouse.
In energy save preferences, I do not have power nap enabled.
How can I go about finding out what often drains the battery?