@Darmitage Yes, but the Electron has several Sleep Modes available. Currently, the Boron doesn't.
The only way that I know to reduce Power Consumption on a Boron is to use the EN pin and an external timer.
I'll publish my results on this post once the 3xAA test is complete. Looks like the Boron will far exceed the calculated 4,000 Startup/Publishes on 3xAA batteries. It's at 3,600 right now.
I've got the test rig ready to perform power measurements over several hours for a Boron tomorrow.
That test will be continuous Cloud Connected to define an average current per day to be used for Power Budgets. I think that will give you the info you're looking for.