01-10-2019 11:51 PM
Welcome to the Lenovo forum!
First of all, we're very sorry for the late response. As per the Lenovo limited warranty of the Lenovo Active Pen https://download.lenovo.com/consumer/options/lenovo_active_pen_warranty_v3.0_201702.pdf?CID=ww:lenov..., you can contact the Lenovo support or Lenovo provider and inquire about the warranty service. You can get the contact support hotline here https://pcsupport.lenovo.com/us/en/supportphonelist?CID=ww:lenovosocial:20x9m6%E2%80%8B (type the serial number of the Yoga and choose your region).