I've cut a hole in cooler lid to fit Joule and make it really tight to minimize evaporation. That works great except one thing: when I'm putting the lid on - sometimes I press the top button on Joule which turns it off and I got "Joule unexpectedly lost power" message on my phone and I need to set it up again.
If you switch from "press" to "press and hold for a second" - that will prevent many accidental turn-offs.
