Why my Apple Pencil does not charge more than 33%?

Chances are that your Apple Pencil's battery is failing. Unfortunately, it is not replaceable. However, you have two choices at this point:

1. Contact Apple Support directly or visit your locat Apple Store or Apple Authorized Service Provider to have them take a look and provide you your options.
2. Get a new Pencil.

Without any other details, it would be hard to tell.

For example:

• Which exact Apple Pencil do you have?
• How long have you had it?
• Do you leave it half-charged or more when not using it?
• Which exact model is your iPad Pro?