I've noticed that even when locked the Pencil will pair with the IPP when ever the Pencil detects movement. The battery on the Pencil will almost be depleted over the weekend (without actual usage). But I'm wondering if it also has something to do with the Smart Keyboard as I can have the IPP charging with the keyboard folded to the back (as if I was using the iPad) and notice that the screen will come on frequently. So in either case it seems there is a bug in the devices (pencil/keyboard) that activate even if the iPad is locked. My only remedy right now is to turn off BT when I'm not using the iPad. ED: one more data point. This past weekend I left work with 100% battery and didn't use the IPP at all. Monday I noticed the standby time was accurate ~100 hours, but the usage was around 50hours.