After we pair the Pencil with the iPad Pro 9.7, if we turn the Bluetooth offline from that iPad, do we need to pair it again? I am asking this for the following reasons: - I don't want to pair everytime I use it, but I don't want also to leave Bluetooth on, since it wastes battery. Of course it's easier to turn it on rather than pairing the Pencil, as in it takes only a second to do it. I noticed after turning it off and on after a few seconds that the Pencil was still paired. The question is: since I don't ever turn this iPad off (only close the cover, for the standby mode) can I turn the Bluetooth off and expect for it to remain paired, or not? Or I need to leave it on 24/7 to avoid this, even if it happens only once a week, for example?