MBP 13" 2016 fast power discharge, no apps using significant battery I have a relatively new MBP 13" 2016 which used to use discharge at 5 - 10 watts without any intensive apps. Today, while unplugged, I noticed my battery discharging at 15 - 20 watts despite closing every app, turning off wifi, and disabling time machine, reducing brightness to medium.

Is there any better way to see what's using energy so consistently? I've tried Activity Monitor and looking at energy impact, but closing every relevant app which spikes energy usage seems to have no affect

Any ideas what could cause it, or how I could fix?

Below are some results from my activity monitor
From the results of your activity monitor screenshots, it is clear that the bash (shell) program ITerm2 is what is killing your battery. We can see this from the average energy impact of 66.25 and the CPU usage of 67%. This means the program is using over 25% of your Mac's CPU (2x CPUs = 200% total).

If you did not start this program, you should (force) quit it. The fact that it has been running over 1 day (25:42:52 CPU Time), and the fact that the problem just showed up today indicates that it is the source of the drain. Perhaps something has gone wrong and it is stuck in a loop.