I agree the Apple Pencil 1 is a great accessory. I bought one for my Apple Pro 9.7” and it has been well worth the investment. The battery in the AP1 is starting to drain fairly fast now. It is only 2 years old so I am surprised the battery degraded so much in that time. Fortunately it charges really fast. I also bought
this charging stand for the AP1 so I don’t have to plug it into the iPad and a neoprene skin so the AP1 isn’t slippery and it makes it fatter and thus easier to hold and use.
ETA: As @pwalker8 mentions below there is an adapter in the box with the AP1 that allows you to use a standard lightning cable to charge the AP1. However, I really didn't like having to keep track of a small adapter and opted to go with an inexpensive dedicated charger.