Crazy battery drain when Idle(note 5)
Check your data usage. In my case, I found the Cloud service had used about 0.8GB of data over night (1.32GB over 2 days), the phone could not recharge fast enough, and it was hot. The amount of data in cloud storage is only 138MB, so I have no idea what that all of that data usage consists. If you have this issue, disable the Cloud app. Other things to check are location services settings, WiFi scanning, notifications. After the Marshmallow 6.0 update, all notifications get turned on by default.