So I own one of the Mario pouch cases I frequently use while I travel, here is the issue, do not turn off your system and use the case leave it in rest mode, if you turn it off and stick it in the pouch and hit any of the buttons the joy con's will turn on and drain, I have actually had one joy con kill the battery forming me to replace the joy con, this time I caught it when the batteries reached 16 percent.. Idk why they don't turn back off not detecteding the console, idk why Nintendo is so freaking stupid, but for what ever reason the joy con's drain..