A m
One minute of charge via the IPP Lightning port will give you a couple of hours of use though - so it's not exactly a massive inconvenience.For me this has been a huge issue, the pencil is the key factor because of which I bought the iPad Pro and after a day and a half in which I didn't use the pencil the battery went down from 100% to 84%, that is almost a deal breaker for me, that means that after 1 week or less if I don't use the pen it will be fully discharged. For now I just turn the bluetooth off but that is not a great solution for me as now I have to phisically connect the pencil every time and I can no longer use continuity on my iPad.
I really don't understand how Apple couldn't think this through any better.