Hi I've had the iPad Pro for a few days now, I love it specially ofr the pencil which is one of the key factors because of why I bought it. My only problem is the following, yesterday morning I fully charged my pencil, but now when I haven't used it since the full charge a day and a half later the battery is on 87% I think this is pretty bad because that means pencil will probbably be dicharged after 5-6 days even with no use at all. So I wanted to know is this normal? Is there anyway for stopping the pencil from discharging when not in use? How long should battery last, in standby and use aprox?